Need info about security, normal Apple events, & indicators of being hacked

I've been trying to learn more about signs of hackage because of odd behavior by my MBP. From what I've read, the consensus seems to be that the problems people experience and fear are hack-symptoms are more likely due to other reasons.
Here's the long story (for the short story, jump to the last paragraph): I've had Apple's on-board Firewall enabled since day one in Stealth Mode and all Sharing settings have always been Off. I recently test-drove a comprehensive 3rd party Firewall also but the log reported no suspicious attempts (aside from the normal amount of people just trying to connect or to piggyback on my bandwidth every .20th of a second that it's active). As the sole authorized user and sole resident in my home, I didn't config the system with myself as a User separate from the Admin account.
But I am having a recurring series of events that seems hack-like -- can anybody help me find the cause and a devise a fix?
Sometimes when I am online I notice a decline in my bandwidth -- based on the quality of my experience, not on a running monitor) for no apparent reason. When this occurs, I have learned to try two things: First, I Speed Test my ISP (sometimes it runs poorly); second, I disconnect and run Disk Utility. If my ISP isn't to blame, my Disk Utility's Permission Repair always reports the following (but, normally, permission repair has either no results or they are different, not security-related):
Repairing permissions for “XXX”
Determining correct file permissions.
Permissions differ on ./private/var/log/secure.log, should be -rw------- , they are -rw-r-----
Owner and group corrected on ./private/var/log/secure.log
Permissions corrected on ./private/var/log/secure.log
Maybe I'm being paranoid but the combination of my online-experience declining and the security-related perm reports generally seem to occur after the barrage of connection attempts from a single DNS stop for a longish period of time, as if there's been success at entry. Until this pattern emerged, I didn't feel vulnerable so I haven't kept records of these times/DNS/repair logs. Another puzzle-piece is that it happens when I've been running my computer for several days using only sleep mode, not full shut down; running a browser continuously (both on- and off-line) for most of that time; and especially after been online for a long time without disconnect.
I'm 98% certain that my secure.logs in Console once contained readable data but one recent day, just after I'd rashly renamed my connection node ScrewYouHacker, I disconnected/repaired (with report of same security changes) only to discover they had mysteriously (or totally coincidentally) become empty -- and my main secure.log plus several of the 5 secure.log.X.gz files became unavailable to me, reporting I (the admin account) didn't have permission to read them. I cannot remember if this was the case before or not but I believe at least one of the files contained data I could read.
My Activity Monitor reports:
4199 mdimport nobody 0.00 3 4.04 MB 44.98 MB Intel
273 usbmuxd nobody 0.00 2 432.00 KB 26.99 MB Intel
63 WindowServer windowserver 1.70 3 90.08 MB 454.81 MB Intel
There's a lot in the Logs I do recognize but lots and lots I'm not familiar with: For example, "nobody" is not the name of any of my drives/accounts/or any Apple event known to me, so causes me concern. I can post more of the stuff that makes me uncomfortable (such as pages being written from external drives during times I was connected but away from my sleeping cpu or when my connection trying to reestablish when I manually disconnect and with no data-seeking sites/apps running on my end) if any of this seems the result of invasion but I'm hoping a simpler explanation will put my mind at rest.
I Clone my entire System quarterly, and did so before I noticed any of this happening, but it was not specially password-protected so is probably just as compromised (or not) as any other available recently-mounted partition on my external drives. I manually back-up only changed files daily so quite likely don't have any retrievable System logs from this period to check or compare against.
To sum my question up in a few words: Does the cycle of bandwidth decline followed by that security-related permissions change imply invasion by hacker? If so, how can I trace what files/apps/devices have been compromised (read or taken)? If not, what does it imply and is a fix crucial (as in, typical Apple self-repair or sign of failing HD drive)? BTW, I'm running a secure wireless Novotel connection card on my MBP with 2gigs RAM.
Thank you all!

Thanks for the quick reply, rccharles.
I don't have a wireless network or a router. I connect via a Novotel Wireless modem/card -- wireless because it enables me to connect to the Sprint/Nextel 3G/4G network on their towers but it is a stand-alone USB device on my end. Multiple conversations with their tech staff assured me that it is not penetrable, in that my "bubble-of-connectivity" cannot be piggybacked upon by others nearby, although no password is used, because there is no network in the traditional sense. When I connect online, it's like making a cell-phone call (which isn't to say it's not hackable just that it's a different set-up). This seems to be supported by the fact that the incoming connection attempts I see on Console trace back to DNS locations all over the world not in my own dense neighborhood. I have no network name and my identity does not show up on the AirPort list with all of my neighbors. The SprintSmartView connection software is completely dumb (at least on the standard interface) because it clears all records upon disconnect (it doesn't even keep a running tally of overall connection time, or in/out loads, only displaying that data while connected during a single-session).
I can't switch to a cable connection because, as noted above, I already employ a hard, direct connection to my modem. For me, "wireless" refers to the provider method not my personal network. I haven't used a network for any service (music, printing, web) during this past year.
I realize you didn't suggest this, Robert, but I just wanted to mention that I have no other connection options -- I've never had cable tv and no longer have a landline so switching from my current method to something else isn't feasible. LittleSnitch probably is a good investment; still, I wish there was a Freeware equivalent.
RE usbmuxd: USB Multiplex Daemon. This bit of software is in charge of talking to your iPhone or iPod Touch over USB and coordinating access to its services by other applications: I do have an iPod but it's not a Touch model; don't have an iPhone -- my Palm mobile is my only non-Apple device, but it has touchscreen technology so that might correlate.
A web search of my Disk Utility Permissions Repair report phrasing didn't uncover enough information for me to determine if the frequent ./private/var/log/secure.log fixes indicate either an invasion or some impending System doom I could at this point prevent.
Here's another set of data that I don't know how to interpret -- but, because I was not using my sleeping but web-connected computer at the time (lid open; display and HD in sleep mode via Energy Saver settings; display calm, not showing any waking/sleeping/waking), the writing of pages/images seems strange (again, I have no automated backup software running):
Nov 19 18:14:18 pp-computer kernel[0]: Started CPU 01
Nov 19 18:14:18 pp-computer kernel[0]: IOBluetoothHCIController::restartShutdownWL this is a wake from sleep
Nov 19 18:14:18 pp-computer kernel[0]: System Wake
Nov 19 18:14:18 pp-computer kernel[0]: IOUSBWorkLoop::closeGate - interrupt Thread being held off
Nov 19 18:15:08 pp-computer kernel[0]: hibernate image path: /var/vm/sleepimage
Nov 19 18:15:08 pp-computer kernel[0]: sizeof(IOHibernateImageHeader) == 512
Nov 19 18:15:08 pp-computer kernel[0]: Opened file /var/vm/sleepimage, size 2147483648, partition base 0xc805000, maxio 400000
Nov 19 18:15:08 pp-computer kernel[0]: hibernate image major 14, minor 2, blocksize 512, pollers 3
Nov 19 18:15:08 pp-computer kernel[0]: hibernateallocpages flags 00000000, gobbling 0 pages
Nov 19 18:16:28 pp-computer kernel[0]: System SafeSleep
Nov 19 18:16:31 pp-computer kernel[0]: hibernatepage_listsetall start
Nov 19 18:16:31 pp-computer kernel[0]: hibernatepage_listsetall time: 205 ms
Nov 19 18:16:31 pp-computer kernel[0]: pages 517541, wire 69979, act 276409, inact 65477, zf 1638, could discard act 19572 inact 84466
Nov 19 18:16:31 pp-computer kernel[0]: hibernatepage_listsetall found pageCount 517541
Nov 19 18:16:31 pp-computer kernel[0]: IOHibernatePollerOpen, mlget_interruptsenabled 0
Nov 19 18:16:31 pp-computer kernel[0]: IOHibernatePollerOpen(0)
Nov 19 18:16:31 pp-computer kernel[0]: writing 516171 pages
Nov 19 18:16:31 pp-computer kernel[0]: image1Size 118063104
Nov 19 18:16:31 pp-computer kernel[0]: all time: 19946 ms, comp time: 3087 ms, deco time: 0 ms,
Nov 19 18:16:31 pp-computer kernel[0]: image 875999232, uncompressed 1688096768 (412133), compressed 868350256 (51%), sum1 79756835, sum2 bb29c145
Nov 19 18:16:31 pp-computer kernel[0]: hibernatewriteimage done(0)
Nov 19 18:16:31 pp-computer kernel[0]: sleep
Nov 19 18:16:31 pp-computer kernel[0]: IOUSBWorkLoop::closeGate - interrupt Thread being held offEnabling XMM register save/restore and SSE/SSE2 opcodes
Nov 19 18:16:31 pp-computer kernel[0]: Started CPU 01
Nov 19 18:16:31 pp-computer kernel[0]: IOBluetoothHCIController::restartShutdownWL this is a wake from sleep
My MBP has no obvious problems with Sleep or Wake, as seems to be the most common complaints connected to much of this language. This type of cycle reported constantly from the whole 3hour block I was not using the CPU. Since my modem is a USB device, maybe that is keeping things cycling even though the display appears asleep (off, not screen saver mode) and hard disk is definitely asleep (per sound & temperature)? I should add to my previous disclosure that I have a Bluetooth Apple mouse, among other devices, and my BT settings have been on Discoverable, which didn't seem to make me vulnerable but I've since turned that off since all my devices are paired. I assumed for everything that was paired with my MBP, the device name would appear in my Allowable list...
Thanks BDAqua -- just saw your post. That puts my mind at rest. What else, if anything, should I be looking at to confirm integrity? Is Apple's Firewall enough or is a 3rd party package really a necessity?

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