Decent card. It'll do pretty well. It is kindof in it's own category. I almost bought it, but decided to save up for the 6800GS instead. If you're not planning on heavy gaming the X1600 Pro's aren't a bad pick.
While the X1600 Pro might have a higher clock speed and more memory the 6800 has a memory interface of 256-bit and the X1600 only has a memory interface of 128-bit. If I were you I would just save up for a 6800GS