Per Doctor? Well... (couldn't limit it for some of them)
Hartnell- The Chase, The Time Meddler and the Tenth Planet...
Troughton- The Tomb of the Cybermen, The Ice Warriors, The Enemy of the World and The Invasion. (I would also highly consider pre-ordering The Web of Fear for its release)
Pertwee- (love this era, so here we go!) Spearhead From Space, The Silurians, Inferno, Terror of the Autons, Day of the Daleks, The Sea Devils, The Mutants, The Three Doctors, The Green Death, Carnival of Monsters, The Green Death, The Time Warrior, Invasion of the Dinosaurs (ignore the dinosaur effects, the story is worth it), Death to the Daleks and Planet of the Spiders.
Baker- Everything from Robot to The Seeds of Doom. Then go for The Talons of Weng Chiang, Destiny of the Daleks and City of Death... I haven't seen much of Bakers later work, so the latter 3 are my only highlights.
Davidson- Earthshock, The Five Doctors, Warriors of the Deep (just ignore the Myrka and its all good) and The Caves of Androzani.
Baker Mark II-
Attack of the Cybermen, The Two Doctors and Revelation of the Daleks.
McCoy- Rememberance of the Daleks, Silver Nemesis (bear with me as they along with Survival are all I've seen from his era unfortunately. I long for Ghost Light, Curse of Fenric and Survival
)
McGann- The Movie and Night of the Doctor.