Logitech and MS are generally good places to look. Oddly enough, MS mice sometimes even work better with Macs than with Windows. I'm in a similar position, as my BT Mighty Mouse is starting to act up occasionally, and the trackball is a bit messed up, and I'm not the biggest fan of the Magic Mouse. Perhaps I'll look into the Magic Trackpad, as I love the one built into my computer and it would be helpful with limited desk space.