Ive never liked a trackball, but alot of people swear by them!!
Anything you can do to eliminate some \'mousing\' is good!!
#1 - A control surface, not to mention mixing with a mouse just plain SUCKS!!
#2 - A 5 button mouse, you can set regular functions like copy/paste/undo, etc.
#3 - Voice command, on my macs i have several voice coomands setup for common functions, at first its odd, but you get use to it, just disable the talkback ;-) that\'s just creepy!