In the planning stages of setting up my rig - hoping to 5 box on 3-4 computers.

I plan to have my main character on my 40" monitor and 2 characters on each of my 2 19" monitors.

Main Computer Specs:
CASE AND PSU
600W ATX
PROCESSOR
Intel Core 2 Extreme QX6700(2.66Ghz)
MOTHERBOARD
eVGA nForce 680i SLI
MEMORY
Corsair 2GB DDR2-800 x2
HARD DRIVE
Maxtor 300GB
SOUND CARD
Creative Labs X-Fi Xtreme Music
VIDEO CARD
GeForce 8800 GTX 768MB
or
GeForce 8800 GTS 512MB
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So far these are the specs im looking at - im not really that great with computers but im looking at post here and other places to help with this.
Things im most concerned with is the compatibility of the parts, the psu and the memory. id like something up to date that i wont have to upgrade within the next 5-6 years at least.

I still need help with my 2? alt computer specs - anything that will run 2 wows with 30fps+ will do

Any suggestions or if you see something wrong please post- open to anything.

Note: I'm 18 years old and my money is limited but I would like to do something exceptional with this and i want it done right, willing to spend 2500-5000 to set this up.

Hopefully i can edit this post as i progress in this planning stage