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I gave my grandma a 9500

If you don't want ATI at least get something like this:

Search Results for nvidia 450 at CompUSA.com

It's from the latest generation, don't go for anything older than the 200 series (like the 9800, for example). Personally I wouldn't go older than the 400 at all.
Doubley make sure your power supply can even handle another graphics card or the new one you plan on installing...I've seen too many times people throw out computers becuase they install a new gfx card and don't first check if the power supply can support it.