I use the Kensington "72123, Mouse in a Box. It's nice and light and doesn't have the annoying round front of many mice. Your fingers have a nice grip and don't have to move that big bumper (like Apple's pretty round bumper-car mouse that will ruin any wrist in 1/2 hour easy)
Don't get a cordless mouse. The batteries add too much extra weight. After using Illustrator for 3 hours you'll know why.
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