Try out the Logitech MX510, it really rocks. It has a really nice grip, its not heavy, and it works perfect. There's like 5 button on it also so its helpful for binds. MX510 for the win! It's doesnt cost so much btw.
Lol @ all of you. MY Logitech ripoff for 19 dollars which I will mod with some glass and light strips will own you all (I like the Razer)