What interface is that card? I'm guessing that's an AGP card (not PCI-E). If so, your options are pretty limited - I'd recommend this Radeon 4650 AGP:
http://www.newegg.com/Product/Product.aspx?Item=N82E16814161308
Basically, you're gonna overpay for a new AGP card. You could try to find a used AGP card off a site like ebay for <$50 if you don't need a permanent solution and want to pench pennies. If you want a more permanent solution, I think that 4650 is a good bet.
If you literally don't need the graphics card for anything other than displaying windows, you could get a $30 FX 5200 (it's a crazy weak card, but it's cheap!) here:
http://www.newegg.com/Product/Product.aspx?Item=N82E16814187044