It's decent but with your processor I don't know if it would make much difference over the HD4650 I linked earlier. In general for that price range this is the best card around right now;http://www.newegg.com/Product/Product.aspx?Item=N82E16814131381
It's a very nice deal and your PSU should handle it I think but once again with your processor it wouldn't matter much. I'd just stick with the HD4650 probably and start saving up to build a new system. You can actually build something quite capable for gaming for about $300 that would be several times better than what you have now.