I prefer a small mouse (I think they go by "notebook mice") because I can rest the ball of my hand on the pad and move it with my fingers. Good for being precise in PS and such while relaxing your hand. And I prefer it to have a cable because not a single wireless mouse I've come across so far has battery life that lasts longer than 10 hours. I'm just halfway through my day by then!
By the way - the magic mouse works on windows too.
By the way - the magic mouse works on windows too.