http://www.guardian.co.uk/tv-and-rad...who-matt-smith
Idris Elba would be interesting.
Hugh Laurie would be an amazing choice but he would be too expensive and unlikely to want to do it. He is a great actor however and I think he could convey a lot of depth to the character too.
The one problem with Doctor Who, especially recently, is that the episodes have been rather bland and pointless. Procedural monster of the week episodes with little point to the story. American dramas tend to explore a theme per episode which can add another layer to the scripts which aren't there is most of the Doctor Who episodes. I would like to see that return and a Doctor who can do it justice.