Intel cpu's are cheaper than AMD when you find a deal on a Dell, but otherwise, if I were building for gaming, A64 all the way. As far as laptops are concerned Pentium M's are the best. I think the Pentium M is proof Intel has the capability to be better than AMD in the desktop market, but it's just not financially beneficial for them to do so, yet. They are not exactly losing money folks, while marketing an inferior product. Personally, I am gaming on a Pentium 630, and for the price I paid for my Dell, I certainly have zero regrets.
OP, keep what you have. The difference is not worth what you'll take as a loss. I have a 630 running with 2GB of ram and a 7800 GTX, and I assure you the performance is great.