For me Dr. Who is and will always be Tom Baker.

In my area, circa 1981-1983, they would play an hour of Tom Baker Doctor Who episodes right before the 6PM McNeil-Lehrer News Hour on PBS. So while in college, I could get in my fantasy and news in two back to back hours.

I've tried watching the subsequent actors as Doctor Who, most recently on BBC America, the only place I know that plays the series at this point, and while they are undeniably bigger budget and more sophisticated from an s-f perspective, I just can't get into it for the long haul like the 70's/80's run. I love the Baker-era cool-looking bug-eyed aliens from that period, and the opening/closing theme song and visuals.