hundredislandsboy :
If you aren't going to do any video rendering/encoding and looking strictly for framerates and smooth gaming, I'd look at an LGA 775 board and run an e8600 at 4 plus Ghz on it. You'll have better framerates than an i7 920 which won't let you get close to 4 Ghz without extreme CPU, chipset, and memory overvoltages and even then you migh tneed liquid cooling for stability. My e8400 uses the same vcore on 3.6 Ghz as it does on stock 3 Ghz.
Plus, e8600 and LGA 775 will save you a few hundred that you can put towards a 26" or 30" monitor to make full use of that GTX 260 sli setup.
I would prefer to use a E8500 (its 100$ cheaper than the E8600). However, its the MB I am having difficulties picking. I don't see many Intel X48 + NVidia SLI MB (prefer Asus) available at Frys. Whether it can use Dual DDR2 or Triple DDR3 is just an extra (Unless someone can point out how much better DDR3 Triple is).
I am currently holding onto a Rampage II Gene + i7 920 for 500$ sale at Fry's earlier (its 550$ without). As for the P6T, its just the Gene with an ATX MB and a weaker soundcard.
If anyone could list MB's that support the E8500/8600 with NVidia Sli that are good, please post links to them so I can check them out.
I was worried that the CPU would be the bottleneck for the 2x260 GTX's, which is why I picked up the i7. Also, I was thinking that a year or two down the road the newer/better i7's would be cheaper. If thats all wrong, let me know.