Logitech G700s. Four buttons on the side, plus the mouse wheel itself can move left and right for two more buttons. It's a godsend.

Logitech G700s. Four buttons on the side, plus the mouse wheel itself can move left and right for two more buttons.…

Vote: Media Player Classic

The logitech mx revolution ( discontinued ) was the best version of this, it clicked when scrolling slow, then went into free spin when scrolling fast, and you could set the speed it changed at. Not sure why logitech went with buttons to change the wheel on the newer mice.