My choice in mice is severely restricted by being left-handed, since pretty much anything claiming to be 'ergonomic' is useless.
Judging by the guide on the Razer's site, I have a mouse style that isn't clearly one thing or the other, but favours mostly small movements.
That said, I use a relatively cheap Logitech wireless lazer mouse.
I used to use a microsoft mouse. I quite liked it, but funnily enough I managed to wear out the left mouse button...
Having a wireless mouse is better than I expected it to be though...
Anyway, I also own a laptop, so the trackpad gets some use.
It's alright on it's own, but horrible for gaming, or even anything where you're going from keyboard to mouse a lot.
I remember trackballs from a long time ago, and while I'm sure there's much better models around, the one I was using was really annoying.
Then there's those funny little joystick nubs IBM designed...
They work better than you'd think, but they're still a bit weird. Not much worse than a trackpad though...
Eh. I'll stick with the mouse I've got all things considered.