I got a new corded Microsoft Intellimouse Optical from Dabs the other day.
OEM version, and a pretty cheap £11.91. Tis a fab piece of kit - very smooth compared to any balled mouse I've ever used either at home or somewhere else. My previous 2 mice have been Microsoft ones as well - Wheel Mouse Opticals. They have been reliable but died fairly quickly after about 3 years of computer rage, caused probably by the fact that as time wore on, the performance would become increasingly erratic.
And always go for wired ones where possible. I hate cordless stuff - not because of the fact that the batteries die every so often and need replacing or charging, but they seem to be (IMO) more slower at response than their wired counterparts.
The scroll wheel is a bit 'stiff' but I'm sure a bit of breaking in will sort it out pretty quickly.
