A RADEON 9600Pro/9600XT (~$150/180, respectively) would be a bit faster, but not by a huge amount. It also has DX9 support and much better AA/AF performance.
However, the better buy right now at $200 is a GeForceFX5900 Non-Ultra card, which will be a big step up in performance. They're priced from about $200-230, depending on model and where you buy. In a similar bracket (slightly more expensive, but better performance, especially in DX9) is the RADEON 9800Non-Pro, if you can find it. The 9800NP also should overclock up to 9800Pro speeds very easily.