Right now for that money i would recommend a 8800 gt. Unless you can get a 9800 card by nvidia or save for a nvidia 280.
here are some links:
http://www.newegg.com/Product/Produc...82E16814133228
best pixwl pipes for the money:
http://www.newegg.com/Product/Produc...82E16814130318
this is a card about 200.00 I personally think the 8800 is the better value. paying 50 bucks more for 16 pipes not worth it to me. here is the link:
http://www.newegg.com/Product/Produc...82E16814150287
hope this helped you. btw if you are going to run any of those cards i would prolly look at a new power supply or a graphic only psu. they can be found on newegg also.