I would recommend ati 9800 pro card. They are very cheap right now.

Or... if you like taking chances... I bought 9800SE with a 256-bit memory bus (you know that its a 256-bit card if it has L-shaped memory chips) and i modded it to 9800 Pro using Omega enhanced Catalyst drivers. Works like a charm (not to mention i only paid 120 euro's for it ).