Let's take a poll:
Best Doctor Who
Worst Doctor Who
Who you'd cast as Doctor Who
Who you'd have as an assistant if you were Doctor Who
My answers are:
Tom Baker
Colin Baker
Gary Oldman
Denise Richards edit: to round out the TARDIS crew, I'd probably have the kid who plays Chesney on Coronation Street for a season and a half, before he was killed off by Cybermen or Daleks a la Adric... ah, finally some alone time with Denise... if you've read this far, you've tumbled too far down the nerd well.