New i7 950 System needs a PSU

[morencyam]

Hello all

So, i'm finally getting ready to build my new i7 system but i need some advice. at the moment my system specs out as such:
Asus Sabertooth x58
Intel Core i7 950
6x2GB OCZ Reaper DDR3 1600 CL6
2x EVGA GTX470 SLI
Crucial RealSSD C300 64GB boot
2x2TB WD Green for storage
2x sata CD/DVD 24x burner

i still have yet to pick a PSU, which is where i need your guys' input. i was looking at a few articles and reviews and found some saying that 2x GTX470 SLI system really only requires 800W max.

i found a few PSU calculators online and filled those out with my specs and none of them recommended anything over 850W.

i would like to get some input from users with a similar set up just to ensure i go big enough, but not too big.

i plan on OC'ing a bit but not until i get a watercooling loop set up to run on that PSU as well sometime in the future.

many thanks to any and all advice/input

Budget=~$200