Lazer or Optical?
Optical: MX518, MS IntelliMouse 3.0
Lazer: Deathadder
It's about preference. I can't stand Razer designs, I'm more of a bulky mouse fan. It would be ideal to hold the mice and get the feel before you buy one.
I also suggest you get the mx518.
Tried many mice (mx510, 518, g5, g10
Another for the G5 - Great mouse