The best one that I have used IMO is the Microsoft 6000. I have been a big fan of Logitech for years and have only bought Logitech, but this mouse blew me away when I tried it on my Aunt's laptop using it to play WoW.
It is very sturdy, unlike with most laptop mice which feel like you can crush with your hand, plus it doesn't cramp your hands like a lot of small mice after several hours of usage.
And with the laser technology, it tracks really well, almost as good as my Logitech MX1000.
Another great feature is that the thumbdrive wireless plugin attaches to the bottom of the mouse so you don't have to worry about trying to find a seperate place to store it.
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