Yeah, I don't mind turning up the sensitivity, and a detachable cable isn't an issue for me, either way. I would prefer two-piece keys, though. From everything I've read, it seems cleaning and repairing a keyboard with one-piece keys is much more difficult.
The main reason I'd rather not buy used is that I'd like to support Unicomp. They've been keeping BS keyboards alive, basically by themselves. That's commendable, IMO.
None of my monitors currently have a resolution over 1280x1024. Still leaning towards the trackball, I guess.