apps/games which perform well with SLi will benefit from 2x8600GT.
the best i think will be to buy a ATi HD4850,will be better than cards that u hav mentioned.
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i7 930 @ 4.5GHz on CM N620 | BIG BANG XPOWER | 3*1GB 1333MHz | GTX 470 | 500GB + 320GB | HAF 922 | Silent Pro M 850W | MX3200 Laser | LG LD460 32" fullHD LCD TV | HP DV6 1211AX[/I][/B]