EVGA SR2-It is here and OH MY GOD is it a thing of beauty!

[Bobsama]

You've all seen me comment before on PSU's.
The heart of a system and honestly there are only two brands I trust.
Corsair and PCP+C..
I'm not saying all the others are junk as surely there are some good ones out there that I'm not familar with but these two brands I know to be good ones.
I have both here in my systems and neither has ever failed me.
Then think of my situation.
You've got an essentially irreplaceable board, a pair of chips worth over $3000.00, couple nice vid cards, 4 SAS drives and you want to trust it all to a PSU you have faith in.

Corsair 950TX should work. Or 1000HX.

2 x 182W (GTX 260-192's)
6 x "5"W (RAM)
4 x "10"W (hard drives)
409W
2 x 200W (CPU's)
=====
809W

1 x 24W (pump)
8 x 1W (fans)
=====
32W

You're probably looking at a max of 850W for the entire system at max theoretical load, including the use of first-revision hardware (such as GTX260's taking 180W/ea). You seriously should be fine with a roughly-1kW unit, especially a Corsair or PCP&C, or their associated OEMs (Channel Well or Seasonic).