For 4500 you can even get a 7300GT. (but dun expect high perfomance by the word GT: cos 7300 is an entry level GPU nd doesn't has the punch).
Go for at least 7600GS for 6500 or 7600LE for even less.
1)6800GS
2)7600GS GDDR3 around 7k
3)Maybe 7600GS DDR2, actually may not be third position
4)7300GT GDDR 3
5)Maybe the 6600GT : not worth the money anymore
6)7300GT DDR2 : around 4.5k or so
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