Logitech Mx518 Optical Mouse, it has 2 buttons on the side for forward and backward for web browsers, + - buttons for mouse sensitivity. Plus a scroll wheel that also acts as a middle mouse button.
Don't know where it lies in price range now, I've had it for a few years.
Stay away from cheap Microsoft mice (?) though.
I had one, and the pointer could go crazy all over the screen sometimes, kinda frustrating in games when it happened.