OCZ Equalizer ($19.99)

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What caught my attention about this laser mouse was the 2500dpi maximum sensitivity. With such a high sensitivity, you can cover lots of screen estate with very little mouse movement, and thus in very little time. The less time you spend moving, the more time you have to attack, making you a more effective opponent in the process. Don't worry, if you don't want or need to operate your mouse at high speeds, you can instantly switch the dpi sensitivity level on 6 levels (400, 800, 1200, 1600, 2000 and 2500 dpi) at the touch of a button. One thing I especially like is that this mouse can be used left or right handed.