LunarTick... the "Logitech MX500 Optical Mouse" that AgentSmith gave you a link to is a very sweet mouse. I have one. You can assign keystrokes to your buttons. This may prove to be very helpful to you. I have nothing negative to say about this mouse.

Here are the buttons.....

There are 10 kinds of people: Those who know binary, and those who don't. 

A whiner is about as useful as a one-legged man at an arse kicking contest.