You can get a x800 for under $200 now, and it will eat a 6600gt for luch too. Unless you absolutely must have SM3, in that case just get a 6600gt - I'm still surprised they're selling for $150 when you can get more powerful cards for that price. A 6800 is also a better choice than a 6600gt, because even though the pcie versions dont unlock, you can OC it and it will be significantly faster than a 6600gt.