How can i monitor network traffic to debug video playback issues from a NAS?

I am having problems playing videos on my new Mini that i am using as an HTPC. 
I have a brand new Mac Mini running Lion with a 2.7 i7 processor and 8GB of RAM with a wired connection to a switch. .
My switch is a NETGEAR ProSafe GS108T-200NAS set to default settings. I haven't had a chance to start messing with VLAN settings or anything else. There is a bit of a learning curve on my part on this end.
My NAS is a ReadyNAS Pro (RNDP6000) with 3 x 1 TB hitachi ultrastar (HUA722010CLA330) drives and a 1.5 TB seagate (ST31500341AS) drive setup in RAID config using X-RAID2.
The problem I am having is video playback when accessing large video files off of the NAS.  These are typically 1080 HD mkv files. 
I have tested movies as small as 7.5GB with only slight stutters on occasion.  I tried a 10.5GB movie and the stalling was much more pronounced. Movies larger than 11GB are completely unwatchable stalling every minute or so. 
I have also tried large movies on the local drive and that is not a problem at all - they play back just fine.  Beautiful playback in hidef.  Mind you, some of these are the same files that were stalling over the network.
I have also noticed that some other network devices get kicked off the network when a movie is playing.
I think it has something to do with the transfer speed of files over the network and the switch - i am no expert at this mind you.
I am wondering if there is some sort of utility that i can use to monitor network activity on the mini so that i can fix my problem.  Or has anyone made chages in their switch settings to optimize data trasfer speeds.
Any advice or recommendations on. 
Thank you all!

OK, I did a couple of things and ran things a couple of times. 
First what I did settings wise:
I enabled jumbo frames on the Mac Mini, ReadyNAS Pro, and the Netgear GS108T switch.  All with MTU set to 9000.
I went ahead and enabled jumbo frames on the rest of the computers on the network just in case.
After these changes I ran into the same problems with videos timing out - very annoying and frustrating as you can imagine.
Then I started playing with device configurations.  My original configuration was NAS > Netgear switch > Mac Mini. I went ahead and switched the switch to an Airport Extreme I have as my WAP and the setup looked like this - NAS > Airport Extreme > Mac Mini. 
Well, long story short, no go.  It appears to me that the NAS is the one having issues providing the necessary data at the proper speed.  I also tried playing sopme movies off of the NAS onto a desktop i have and had the same issues - choppy frames and crashing movies.  I even tried connecting wirelessly to see if that would work. 
BTW, I have the Mac accessing the file system using CIFS. 
I don't know what else I could do.
I am going to have to go to the Netgear forums to see if i can figure this out.  Hopefully, I can get things going to be able to help some people out.
If anyone has any ideas, they would be greatly appreciated.
My only other alternative is spending $2000 for the thunderbolt capable NAS that Apple sells - it's only money!
Cesar

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