Christopher Eccleston

I have a bit of a crush. He is sexier as Doctor Who than in any of his other roles, as far as I can tell. Of course this is based purely on a survey of photos on the web, as I've hardly seen him in other roles. But dude, he rocks as Doctor Who!

And Billie Piper as his companion... she is lovely, and she can act, and they have great chemistry. The growth of their friendship over the course of the first season is a joy to behold. I do look forward to watching the second season, although with my fondness for Chris in the role it's going to be a jolt to watch David Tennant make it his own.
Y'see, the Doctor "dies" at the end of season one; he regenerates (into David Tennant). A poignant scene. The entire end of the last episode is heart-wrenching. Really. I loved it. It's that good.