I'd say go try all of them on display, and see what fits your hand then choose from those... if it doesn't feel good in your hand, it'll never be precise.
This is a great mouse. Can program the 8 buttons to do about anything. Any Logitech mouse would be a good buy, just depends on how many functions you want...
I second the Intellimouse Explorer. The extra buttons, which I have assigned to the Expose hotkeys, makes me a productive "panzy", even on a 12" screen. No problems with the mouse, and it matches the PB well.
The intellimouse optical is the best. Its cheap but its got the best grip. I bought a kensington rechargeable wireless studio mouse but the its not very smooth and the touch sensative scrolling seems like a great idea but its horrible to use. Also the charger blinks rapidly when the mouse is moving to show that its recieving but that gets annoying (you can't hide it because is the reciever as well as the charger).