Or how about this...
Robert Picardo!
He played The Doctor, now he gets to play The Doctor.
I like that idea, he could make for a good "final regeneration" of the Doctor before they give him more of course! He could make a good "brooding doctor" who has to come to grips with his mortality...
I like David Hewlitt and he is still somewhat british/canadian, etc...
Richard Ayoade would be a good choice I suppose for a different direction from his roles in the IT crowd and The Mighty Boosh he could be either really nerdy or really cool...