I'd want to get a finger trackball, but they're kind of expensive. Something like Kensington Orbit.

Recently I got a mouse. One with side scroll wheel, but just a normal one. I am honestly disappointed. First 2 days I found myself being less accurate with it than TrackPoint. And it also feels less comfortable to use.
It's only better if I have a second monitor to the side.

Also, I wish I could somehow get easily varying sensitivity. Say, the more I press, the slower it moves. Or even just such 2 speed selector. Maybe it would get hard to predict with that pressure idea.