ahh, there's another suggestion instead of two x1800's ....
grab 2 x1950 pro's i just saw a graph and 2 of them in crossfire are close to performance of 7950 gx2 which = 9000 3dmark06
i have 1 myself, and i love it
Intel 3770k @ 4.4 GHZ | Galaxy GTX 770 SLi | 16 GB G.Skill Sniper | ASrock z77 Extreme4
2xSamung 840pro 128GB in Raid | 2x1TB Seagate | Antec 750 Watt GamerSeries
Intel Core i3 3220 | Galaxy GTX 650 | 8 GB Corsair Vengeance | ASrock B75M | Samsung 840 120GB