At that price range you can get a great card. I'm a fan of ATI products. I'm gonna buy this soon:
ATI 9700 PRO With shipping it'll cost $279.75. Also the
ATI 9500 PRO is a great card for $205. If you do get an ATI card make sure it's a PRO. Just do a google search and read a few reviews of those cards. I've never seen a bad review of either one.
If you wanna max out your price range then get an
ATI 9800 PRO.
