Eh, I've got a bunch of mice. I use a DeathAdder 3500 with my laptop, generally. Really like that mouse, although I'm thinking about getting the Black Edition because it looks so beautiful. I really do miss having easily accessible on-the-fly DPI switching, though. As a result of that, I'm using a Xai at my main desktop. That is a fantastic mouse. I would have to say that my absolute favourite, though, is my old SideWinder X5 which is now dead. That was the most comfortable thing ever. And, I've got a crap little Microsoft Basic Optical mouse that I use when I take my laptop to uni, because the desks there are way too filthy for my beautiful DeathAdder.