My TT's Mouse cost me 50p from a junk shop about 10 years ago and its been absolutely flawless ever since. Its a Genuis Serial Mouse back from when Genuis made good kit.. Tiems have changed though, cos Genuis kit these days is bloody awful.
Possibly the best mouse I have ever had.
I also got an Optical Mouse too, but the felt on the bottom of it, got worn down and its scratched the Mouse mat ( Its one of the old type Optical mice that need that mat ) and its gone too bad to be used properly.