I was introduced to the good Doctor in the new series over the summer. After my friend and I had watched every episode from the first two seasons I started watching the classic stuff to fill the sudden Doctor Who void in my life.

I find myself a fan of all the even numbered Doctors;
Two is awesome and has the only companion to rival Sarah Jane; Jamie.
Four is so iconic and impish that it hurts!
Six is dark and snarky and I love him and feel that the BBC gave him a raw deal.
Eight, while stuck in a bad movie, managed to be charming and weird, and since it was Paul McGann, super super cute.