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If you want to use a mouse in photoshop I recommend you consider some of the better gear for computer gamers. Specifically, consider getting an optical mouse from either Microsoft or Logitech. Even though you don't need a mouse pad with one of these I'd highly recommend one, the latest and greatest are made by EverGlide, RatPadz, and fUnc Industries. The are indestructable, look great and allow optical mice track with incredible precision. Finally, a Mouse Bungee will let you forget about that nasty mouse cord that is always snagging at just the wrong time.