Well for 40-50$ you aren't going to get a great GPU, but an ATI 9800 would probably be better.
http://www.newegg.com/Product/Produc...82E16814102587
Good rebate, and a bit better then the 6200s. But I would save until you can get a better card-it will be worth it. Anything in your price range won't last long and will only cost you more $ later on.