I have to confess (I can already hear the calls of 'HEATHEN!' over the internet) that I haven't watched Doctor Who since Sylvester McCoy became the Doc. Lost COMPLETE interest at that stage!
Got Jon Pertwee to sign a Doc Who card at the NEC during a retail business exhibition many, many moons ago. He seemed like such an incredibly nice gentleman and was one of my favourite Doctors. I was gutted when he passed away.
My other favourite Doctors were definitly Tom Baker and as a huge fan of Peter Cushing, I also think he was a brilliant Doctor as well. I did think that Richard E. Grant was a good choice in the animated Doc series that was on BBC Online not long ago (I think that was 2003 or 2004, just watched the first few episodes of it) and wondered why he didn't go on to be the Doc in the actual new series.