Who does it for You?

[Scooter]

This makes me think of the Curse of the Fatal Death, where we got to see a slew of very different Doctors (including Joanna Lumley!). Hugh Grant even had a great take on the role, but Rowan Atkinson nailed it.

Someone once mentioned Hugh Laurie as a possible Doctor, and that's a fascinating thought. Also a possibility in a similar vein is Simon Jones.

For a darker but still wryly comic Doctor: Alan Rickman!

But my top choice for a solid, fascinating Doctor that harks back to Hartnell: Terrence Stamp. Wrap your mind around that.