Right now, the only Mouse manufacturer with 10.1 drivers is Kensington. Try their new MouseWorks 1.1b1, it might solve your problems...
As far as Mice go, I really love the Microsoft Intellimouse Explorer. It's great, even if the 2 extra buttons don't work yet in OS X. The right click and scrollwheel work just fine. The mouse itself has the best feel of just about any multibutton mouse out there. Also, I would be MS will have drivers out for OS X soon. They are really on the ball with their OS X development.