I'm using a Athlon 3200 (Socket 754) and a 7600GT as well but with only 1.5 GB of RAM.
I think it runs fine now.
But to answer your question, definitely skip the 8600 cards. There are almost no difference between a 7600GT and a 8600GT.
The best choice will be a 8800GTS since it is pretty affordable nowadays.
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