Unfortunately, Lenovo makes the best trackpoint hands down. Dell and Toshiba both offer models with one (I believe HP used to, but not anymore). Dell doesn't offer a middle mouse button on the models I've seen, which makes the trackpoint hideously inconvenient for scrolling. Toshiba does, but the trackpoint just doesn't feel as good as on Lenovo models. Lenovo won't get any of my money anymore after Superfish, though.

The answer for me is to use the keyboard as much as possible. This is already possible in a large number of text editors, and there are a good number of browser add-ons that will allow you to control everything completely mouse-free.

edit: corrected some spelling