Heres a nice list for you.
7600GT(150+) Get this if you want newer technology like HDR and SDRM 3
X1600...(150+) I suggest staying away from this card is has a very bad performence
X800GTO good card, good price has 12 pipelines but with a little modding here and there you can get it to run at XL speeds and 16 pipes.
If i may suggest mine own here an X1800XT would be the best saw it on newegg for a mere 200 bucks cant beat that price.