I've also got a Logitech, an MX-400, which isn't a gaming model at all, but works happily with my Mac, is nicely rubberized on the sides, and has a scroll wheel that tilts left and right.

When I was shopping, I fell almost in love with the Microsoft Natural Wireless Laser 6000, which feels very cool in your hand. Unfortunately, it's wireless but not Bluetooth. So what, I need a dongle behind my computer to use it? *sigh*