Tom Baker was the best, but the older Doctors weren't bad either. Haven't seen much of the newer ones, except for one episode about a lone Dalek terrorizing some kind of compound. The Dalek kind of stole the show, I didn't actually see much of the Doctor himself in that one, though what I did see didn't impress me much. I also remember that that episode had been made into a weird little online game on the Doctor Who website.

Lastly, I recently discovered a whole bunch of old Doctor Who books in a cellar. They sure made a lot of those.