Go to Radio Shack and buy a cheap two-button mouse. I think the Mac mouse is an idiotic design. Sure it looks neat, but it is hardly functional. I use Wacom drawing tablets with their cordless mice.
These have two buttons and a scroll wheel, and you can switch to the stylus anytime you want. You can get one of their little 4 X 5 ones for well under $ 100.
Don Williams La Jolla, CA