Have you watched any serials featuring either William Hartnell or Patrick Troughton? The vast majority of their serials are only available through Audio CD with narration or the Loose Cannon reconstructions. I highly recommend The Time Meddler (another Gallifreyan!) and The Dalek Master Plan (audio) are recommended for Hartnell. For Troughton, take your pick but especially The Power of the Daleks, The Two Doctors, Tomb of the Cybermen, and The War Games.
Anybody else a Doctor Who completist? I'm still importing the DVDs from England via Amazon UK.