Wireless Network with Time Capsule -- 2 Questions (5 GHz? 2nd Network?)

Hi all:
First off, thanks to all of you for being there. Apple Discussion Boards are the best!
OK, to start with, here's my gear list:
-iMac 27" QC (bought Dec. '09), 2.8 GHz, 8 GB RAM, running 10.6.4
-Time Capsule 802.11n, 1 TB (bought April '10)
-Airport Express 802.11n (bought April '10)
-iPad
-iPhone 4
So I set up the Time Capsule a few months ago, and paired it with my iMac and with the Airport Express (to stream AirTunes), and everything has been working fine.
The iPad and iPhone are also working fine. (In Airport Utility > Advanced > Logs, the iPhone shows a rate of 72, signal -60, and noise -94. And the iMac shows a rate of 300, signal -47, and noise -96. Don't know if that is good or bad or normal.)
So, here are my questions:
First, in Airport Utility > AirPort > Wireless > Wireless Network Options... should I check the box that says "5 GHz Network Name"? It is currently not checked. Would that increase performance? (All my devices - iPad, iPhone, Airport Express - are "n" devices, right? Does that mean I should check that box? Is that even an issue?)
Second, when I first set up my wireless network I named it "MP Network." But I notice in System Preferences > Airport > Advanced that there is another network that apparently was set up when I first set up the TC. Its name is "Apple Network" plus 3 letters and 3 numbers.
What is that? It doesn't show up anywhere else. Should I delete it? Is it using up bandwidth by being there?
(Both networks appear in that same place on System Preferences, and both are WPA2 Personal.)
Thanks to anyone for any input/advice. And apologies if any of the above is confusing.
Matt

+So it sounds like I should leave the network as is, right?+
Yes, this makes sense for most users. Some users sometimes have trouble with a new computer that sometimes connects to the 5 GHz network and sometimes connects to the 2.4 GHz network. They want the computer to always connect to the 5 GHz network so they assign a separate name to that network and configure their computer to connect to that network first.
+The iPhone being "g" does not reduce my overall performance, right?+
No, because it's using the 2.4 GHz band. Faster devices use the 5 GHz band.
+And my TC broadcasts dual band so the "n" devices get what they want and the "g" device gets what it wants...correct?+
Yes, but you need to remember that "n" devices can connect at either 2.4 GHz or 5 GHz.
+(The 300 Mbits/sec I am getting on my iMac is good, right? And is 72 for the iPhone good, too?)+
300 Mbps is outstanding. Most users average 220-270 with a good connection. The iPhone is a "g" device, which means it can operate up to 54 Mbps, so I'm not sure what you are seeing here.
+As for the other issue of the "out of the box" network name, I think I will delete it. (I am of the school that enjoys things clean and avoids unnecessary clutter!) But will that create any problems for me? Is it as simple as clicking the "-" (remove) icon in System Preferences > Network > AirPort tab?+
That's all you have to do.
I can't remember if the password for the Apple Network xxxxxxx is stored in Keychain Access.
Macintosh HD > Applications > Utilities > KeyChain Access
Look for a listing of the Apple Network xxxxxx and delete that entry if you want to remove all evidence of that network.

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