seeing how deathhell77 posts, i dont think we should really pay attention to what he says.
Not everybody wants to Overclock by the way.
and Overclocked 8600GT can be easily beat by an 8800GT, even an 8600GT SLI can be beat by a single 8800GT.
and from what you post, it seems like you play on a really low resolution.
The 8600GT pretty much has the same performance as an 7800GT.
The 7800GT pretty much beats it in gaming, but it loses to the 8600GT on video encoding/decoding. The 7800GT has about 9.6GB/s faster memory bandwidth and the memory bus width is 256-bit, much better than the 8600GT/GTS 128-bit bus width.
It seems like he wants a card for gaming, so the 7800GT would be better than the 8600GT