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2 of these in SLI?
http://www.newegg.com/Product/Product.a ... 6814130365

or

2 of these in SLI?
http://www.newegg.com/Product/Product.a ... 6814130429

oh and this.......

http://www.newegg.com/Product/Product.a ... 6817190021

If your gonna do it, and money is no object, get the faster ones.

Make sure they will fit in your case, they tend to be a bit on the long side. My 8800GTX is 10.5" long, barely fits in my full tower case.

AMD Athlon 64 X2 5200+ Windsor 2.6GHz Socket AM2 89W Dual-Core Processor Model ADA5200CSBOX
ASUS CROSSHAIR AM2 NVIDIA nForce 590 SLI MCP ATX AMD Motherboard
ASUS PHYSXP1/128M/GRAW/A PhysX Processing Unit 128MB 128-bit GDDR3 PCI PhysX P1 (I think I have pulled this out already)
CORSAIR XMS2 2GB (2 x 1GB) 240-Pin DDR2 SDRAM DDR2 800 (PC2 6400) Dual Channel
EVGA 640-P2-N824-AR GeForce 8800 GTS 640MB 320-bit GDDR3 PCI Express x16 HDCP Ready SLI Supported Video Card
APEVIA ICEBERG ATX-IB680W-BL 680W ATX12V / EPS12V SLI Ready Power Supply

Check out this 1000W Corsair PSU:

http://www.newegg.com/Product/Product.a ... 6817139007