There is no 8600GTX. The 8800GTS is a bit better than the HD2600XT for most games, especially with FSAA. Priced the same I'd want the 8600GTS for gaming, but until recently the HD2600XT has been much cheaper and the better option IMO. Either is a good option if $100 is your max. Once you apprach $150 and up you can get twice the performance or more out of a HD3850, HD2900 pro, 8800GT, etc.