The 8800GT needs 1 6-pin connector per card.
Never, ever skimp on the quality of a PSU. A cheap model can kill your whole system just like that. So I suggest the Corsair 620HX. Modular, great stable power.
http://www.ncix.com/products/index.p...acture=CORSAIR. This will be plenty to power your Quad, and dual GPUs.
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Main: GA-X58-Extreme - i7 920 - TX750W - Raptor - 3Gb DDR3-1333 Triple-Channel - GTX260 SLI'ed - TRUE - P182
HTPC: M3A78-EM - 5000+ X2 - HX520W - 'cuda 1Tb - XP2-5300 2x512Mb - 9800GT - SI-128 - Prelude - Moneual 932B