Other people will say otherwise, but a good 650W (I like the corsair TX650) power supply would easily power that system. 32mm Sandy bridge processors use very low voltages (hence the low 95W TDP), and while the 6950 does use a good bit of power, it doesn't use a ton like a GTX 480 or something. If I were you, I would invest $100 in a good TX750 750 watt power supply for peace of mind, or even an 850 watt one if you ever plan on adding a second video card.
Sick build by the way. Makes me very very jealous.
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