I don't know but it has to be someone who can pull off being really random and funny and have awesome facial expressions. I really hope that the next Doctor isn't any younger looking than Matt Smith (age 27).
The Doctor wishes to regenerate as a ginger. What if he did? Which actor would you choose to play him? My vote is for Domhnall Gleeson (Bill Weasley). Who would you pick?
I vote for Rupert Grint--he needs a job. Domhnall Gleeson can get work, while Rupert just putters around in his ice cream truck.
While I agree that Rupert should get a job, I think he's too young to play the doctor. Matt Smith is pushing it a bit by being in his late twenties as it is. I think that if doctor who is still going in 10 years time, perhaps then Rupert could do it, but I feel he needs some maturity (though we all know the Doctor is soooooooo mature) and to outgrow his role as Ron.