The 80s is my personal favourite, although it depends on taste. I can't stand a lot of 70s Doctor Who, however it is considered the golden age of the show. I'd say late Baker as from the 80s, the continuity all starts to get "closer". The E-space trilogy is where it really starts of although it is pretty bad. Personally, I'd say Go from the Keeper of Traken (Bakers penultimate story) and go on from there. Although what I'd do first is see "the best" of each doctors era (one story each), view them, choose your favourite/s, and then choose which era to follow.