What is your favorite mouse?

I recently bought got a new Macbook Pro (13 Retina, 8GB, 256GB), and this silly logitech chorded mouse from my job isn't getting it done. What do you guys use? Does anyone have the Magic Mouse? Is it comfortable? Otherwise I'm just looking for something really comfortable, and compact. Preferably with built-in bluetooth so I don't have to eat up one of my USB ports. Any recommendations? Thanks.