Picked up an Intellimouse Explorer. All I have to say is... Wow... This is definitely the best mouse/sensor combo I've ever used in a game. Everything just feels right.

The magic behind it is the sensor. It tracks great and it's the only mouse I've ever used where you can pick it up and put it down without disturbing the on screen cursor. That makes it the perfect gaming sensor. I wonder if that's just a happy side effect of it being only a 400 dpi sensor? And the 400 dpi doesn't really bother me. Actually it's probably a good thing because it keeps me from getting lazy.

The only issue I have with it is +mwheelup gets used without me ever touching it sometimes...

Other than that I think I've finally found my mouse.