Hard-core gamers, the Logitech MX518 was designed with you in mind. This 1,600-dpi optical mouse has two unique buttons, one above and one below the scroll wheel, that let you change the mouse's sensitivity on the fly, even while you're playing. If you prefer games that require fine mouse control in some scenes and looser, quicker movements in others, you'll appreciate this capability: The cursor can speed across the screen or barely move at all. You can customize the settings with the included software.