I am surprised that no one has said the cordless optical trackman. I have one of theses, and would never ever use a regular mouse again.It has 8 butons (inc. the wheel) has great battery life, is very percise, etc.
It is pricey, and if you have never used one, its a little acward at first, but trust me, you'll love it.
And hey, if you buy it from a mega store, you have 30 days to play with it to decide for yourself.
http://www.logitech.com/index.cfm?pa...9&languageid=1