The 2600XT's still outperform my 3650 any day of the week (not by too much though). The best part of my card is the 512MB ram which is GDDR3. Still though the GPU core is not the best. Cost me 62$ OEM so w/e, should be able to handle my gaming needs.
Wait I always thought you had a 8500GT, you should look for a cheap 2600XT if you can and hybrid crossfire that. You should notice quite a jump in game play.