Here's my "elite" repertoire of mice:
IBM TrackPoint, great suggestion. It's not like other trackpoints, it feels great and once I got used to it, I became faster than with a mouse. For light scrolling/selecting, drag/dropping it's great. The other huge plus here is the renowned IBM keyboard which has been my favorite for years.
Logitech MX518 mouse. This thing was a workhorse for me on desktops before I fell in love with my T42p. BUT, and this is Huge, you have to set it up the way I do (just try it):
- left side button 1 for [Ctrl]
- left side button 2 for [Ctrl + Tab]
- front middle button for [Space]
- middle button (click wheel) for [Enter]
- button behind click wheel (hard to hit) for [Backspace]
This configuration allows you to do really cool things like switch tabs in IDEs (Eclipse can be configured), Ctrl+Scroll to resize web text or documents in Office, Ctrl+Click to open links in new tabs, space and backspace for those rare times when you're editing with the mouse (skipping around the text at a pace that you would break your brain if you tried to simulate in VI), and as a plus space and backspace work for going back in browsers and paging down :)
Trackball - A good trackball has no match in my opinion. The $100 Kensington you find at Microcenter or other places is the bottom of the line as far as this is concerned, and I was really unhappy with the software.
One final tip: Change your Caps Lock key into a Ctrl key. Not if you use Emacs (shudder) though, that'll probably cause your fingers to bleed purple or something.