Need help choosing Power Supply

I'm about to buy parts to build a new rig in a couple of weeks. I have already decided on everything except on which psu i should get. My rig so far ... x6800 proc, evga 680i mobo, 2x 8800gtx in sli, corsair dominator ram (2x1 gb) 1066 mhz, 2x 150gb wdr hd and silverstone tj09 case. Both PSU's that i wan't are both sli certified for dual 8800gtx's. At first i was going to choose
but my friend told me that i was just wasting my money for no reason and told me that i'd be better off with
I just wan't to make sure that the pcpc psu is enough to power my system withuot any problems. Also which one you would pick too. Would like to here some opinions thanks.
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  1. The Coolermaster, by a mile. Much better spec for your money. You may never need to buy another PSU again!

    The Cool Master Real Power Pro 850 Watt is Dual GeForce 8800 GTX Certified.

    The PC P&C Silencer 750 is only for Dual GeForce 8800 GTS or Dual GeForce 7950GX2 systems.

    Thus the Cool Master Real Power Pro 850W is the far better choice, as said, you may not need another PSU for 5 years.
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