We're building a mid-range gaming rig here- we've decided to keep it last-gen to keep the costs down. Someone that saw us looking over the pieces began warning us that the mobo we had chosen would conflict with the RAM we were gonna use- so we thought we'd get a second opinion here with you guys.
By the by, we don't need to run Crysis on this thing, we're gonna use it for not-so demanding games like L4D, TF2 or Call of Duty, so we don't need to hear about how we should've gone with a Core i7 Extreme and 4 video cards (unless, of course, you have better and cheaper suggestions, then we're all ears).
well for the PSU, you did pick an sli board so i am assuming tou are going to be getting another GTX260 sometime (hopefully). If you do plan on getting another GTX260 i would get a 750w (Corsair 750TX) if not a good 550w would do you fine (Corsair 550VX)
now you don't have to use corsair (i prefer it and it is a good brand), antec, seasonic, c power & cooling are good brands as well
Do not shoot yourself in the foot with a dead end S775 system that is overpriced. Nforce motherboards like the 790i tend to be pricey and I am unsure if they ever fixed the data corruption issue when overclocking. I know you do not want to hear this but for only $70 more on the mobo/cpu combo you could just go i7 and be done with it. Unless there is a micro center nearby and then the cost would be about even. Other option would be an AM3 setup. Like others have said, triple channel ram is only for i7 so that would lower the cost of your original idea for mobo/cpu. Here is a rundown of what the systems could cost you with some adjustments with regards to ram choice.
Total: $579 shipped
Pros: Upgrade path, SLI or CF, best performance platform
Cons: Costs more
GIGABYTE GA-MA790XT-UD4P AM3 only motherboard
Same Gskill ram as the core 2 build
Phenom II X4 955BE
Total: $418 shipped
Pros: Upgrade path, CF, Gaming performance similar to i7, cheaper; costs allows for better graphics cards like the 4870 or 4890 1gb.
Cons: No SLI, Gets beat by i7 in most if not all non gaming apps
If not wanting to spend a lot of money I would go with AM3 over the S775 system. You can get better graphics card and not be stuck with a dead socket with no real upgrade potential.