The Radeon 9500 is in your price range. It uses the same GPU as the Radeon 9700, but crippled with slower memory and fewer pixel pipelines.
Even with thes limitations however, it performs on par with a geforce4 Ti 4200, and when you turn on FSAA and anistropic filtering it does much better.
Plus, it is DirectX 9 compatible instead of DirectX 8 compatible.
ALthough if you can afford the extra $$$ for the 9500 PRO version, it's quite a bit better. But for $140 US, you should be able to find a Radeon 9500 non-pro version.
Hope this helps,