deskthority

I would recommend a Filco as well. Alternatively you could go for the Leopold as suggested before in case you don't want to spend that much money.

I can't give any recommendation, unfortunately. The last time I used a trackball was certainly more than 12 years ago. And back then they sucked like hell (at least for me). I was told that they have been improved quite a lot by now, though. Anyways, I don't think that I'll switch from mouse to trac...

May be possible. However, I don't see that happen any time soon. Our "old-school" keyboards will be around for a while.

No, I do not use them. The first thing I was thought in the typing lesson was to throw that away since it slows down your typing speed and it can cause the carpal tunnel syndrom.