Corsair XMS2 does not run more stable. ASk the hundreds of people whose XMS2 won't fire up with their board or better yet all the people who have gotten 1 DOA stick on a dual channel pack. Corsair Value is great and That's almost always the best for the price of value, but their XMS2 line I'm highly dissapointed. Also the 680i's features are what SLI and a physics card? Who actually buys or needs a Physics card and how useful is SLI?
Even in SLI 700w's is pure overkill for two 8800GTX's or so, as a single card can be run by a TT Toughpower or FPS 400w.
EDIT: The motherboard has nothing to do with his high 3D marks in general, it's becuase he can run SLI 8800GTX. Nor does the PSU effect your overclock by having 500 unused watts. As for the memory I never said the Dominator ram wasn't amazing, it may be overpriced but it's one of the best ram if not THE best out there. I was talking about their standard XMS2's they they sell which is overhyped.
E6300 w/ Arctic Freezer Pro 7 @ 3.6ghz 1.4Vcore
Antec 900 Case
EVGA 750i FTW Mobo
4x1GB of G.skill DDR2-800
2 8800GT in SLI
22" Samsung Syncmaster
1 250GB WD and 1 Seagate 7200.10 in RAID 0
Corsair 520HX 3DMark06 Score: 13900