Mouse/Trackball preference?

[Alex Bochannek]

I was wondering what mouse/trackball preferences other Ion users had 
considering you likely don't use them as much as other people need to. I 
need a three button pointing device and I like a scroll-wheel, but not one 
that also doubles as button 2. I am considering getting one of these: 
<http://www.kensington.com/html/4136.html> simply because of the scroll 
ring even though I am not generally a big fan of trackballs.

Comments? Opinions?
Alex.