So we seem to be on personal choices.
So, here's my choice. He was my favourite back I 2008/9 to replace Tennant. He was also my choice for Bond in 2004/5 when they were replacing Brosnan.
He has a quirky look, could carry off the Doctor well, fantastic actor, British. 45, but looks younger.
Everyone will probably know him as Count Adhemar from A Knights Tale, or Adam from Abe Lincoln: vamp hunter, or even Jacob Hood from the aptly named show, Eleventh Hour.
Tried to find the most Docor-esque shots.
"Course your not,your not scared of anything. Box falls out the sky, man falls out of box, man eats fish custard. Look at you, just sittin' there,you know what i think? Must be helluva scary crack in your wall" - The Doctor