In my opinion the greatest mouse ever made was the logitech mx518, however their newer laser edition model the G5 is almost as good ( their new button re-arrangment, paint scheme, and taking out 1 side button was a BAD idea ). I recommend the logitech mouses over razers because logitechs are usually right handed only ( which means if your right handed it fits better ), where as the razers can be used by any hand since they are symmetrical