Peter Capaldi was in a series of Torchwood - Children of Earth, was it called? Think I've blocked it as it really really upset me! Anyway, he was excellent in that (very warm and morally torn and tortured) and that also gives him a Who-ish connection - though would a big previous role in Torchwood write him off as a possible Doctor??
Rory Kinnear is already filming something next month (Lucan miniseries for ITV), which is right when the Christmas Special is filmed so chances are it's not him. I'd quite like it though, he's a good actor. Capaldi would be absolutely lush, but he's not only been in Torchwood, but he's already been in Who too (Fires of Pompeii).
I would love to see a peter Capaldi in the role, been a fan of his ever since Local Hero back n about 1982. I think he is an amazing actor.
Others I wouldn't mind seeing are:
Michael Sheen (was in Twilight...I know, I know) amazing actor, Welsh too but suspect he is tied to the US. Got a feeling he has a child over there who he remains in lots of contact with so guessing long periods n the UK are out of the question.
Rupert Grint is being speculated on as well....don't know if this is a giggle or if he is truly in the running, funnily enough I think he would do a great job.
All the talk of magic and whodini (!) made me consider "Paul Daniels and the lovely Debbie McGee" . - somehow I suspect NOT!
IIRC, Freema was retconned as being the cousin of the original character she played, and similar with Eve Myles (Gwen was a distant relative of Gwyneth) Companions are different from the Doctor, things can get handwaved and explained. Colin Baker was a different era, less scrutiny of previous episodes (because of the lack of Youtube and the internet, DVDs or even videos at that time) I think recycling someone as the Doctor would be more problematical now, but obviously that doesn't mean they won't