I have been working with adobe ptshp and painter 5(Metacrations) for the last 3 years and have been cursing the mouse for about the same amount of time. The mouse I'm using came with the system(Packard Bell). It works fine, but not for graphics--the tracking ball is located in the heel of the mouse(roughly centered in the middle of your palm) which makes control very difficult. It's like trying to sign your name with the point of the pen in the middle of your palm.--Any suggestions as to what I should look for in buying a new mouse-(ex. track ball location, track ball size??