I've seen the entire run of the original Dr Who vs The Daleks, back in black and white, when nobody knew who the Daleks were. That was brilliant, still good even today.
The reboot of the show is generally pretty good, I think. Its made an otherwise niche show into a mainstream broadcast, so all credit to the team there. Even if it was starting to wane under Russell T Davies, the new head writer, Stephen Moffat, is an incredible writer - Matt Smith is doing a pretty decent job of it as well, so far. Nice to see a range of emotion in the Doctor every now and then.