are you really building this computer or is just one of those "if i had alot of money" deals where you could pick any specs with an unlimited budget?
This sounds stupid
But if you're serious, go with quad opterons, dual 147GB 15,000 (5 in raid 0)
dual 7950GX2 to make Quad SLI
128GB Ram, Windows Pro, PC+Cooling 1000Watt PSU, some quad opteron motherboard
that's all for now
unless you have a real budget, you really need to bring this down.
If you have a "real" budget, go with a FX62, single 7950GX2, RaptorX hdds, ASUS M2N32-SLI Deluxe Wireless Edition, Corsair XMS2 4GB MEMORY (two 2048MB kits)Windows Server X64 2003 R2.