1. Laurence Fox
This might seem like an odd choice; as Hathaway in Lewis he is more used to playing the companion than the lead. He does, though, have an extra dimension to bring to the role. He is married to Billie Piper who, of course, played Rose with both the ninth and tenth Doctors. He is reported as looking to move to the US as their is more work there but maybe the attraction of playing the Twelfth Doctor could convince him to stay? As I said at the beginning this is all speculation and we hope that Matt Smith gives us plenty more bow-tie adorned years as the Doctor. One day though the time will come for a regeneration - who would you like to see as the Doctor?