Stick with the 7600 for now. Integrated graphics cards are terrible. They are NOT efficient unless they were built with at least 512 dedicated memory. otherwise, it will suck up using your system memory and it's not as fast or efficient.
I guess it also depends on what you are doing with your computer. If you are mainly playing games, then definitely keep the 7600 until you can upgrade to something more recent, such as the 5770.