Also, I'll be posting my thoughts on the progression of Miracle Day tomorrow as well.
Some of the existing Game of Thrones actors don't quite match my mental image. Some of them haven't been cast yet. Others characters - like Tyrion, Tywin, and Walder Frey (OMG DAVID BRADLEY WAS MY MENTAL IMAGE FOR HIM BEFORE THE HBO SERIES WAS EVEN ANNOUNCED) - are so spot on that any other casting couldn't possibly bring them any closer to the character.
Whatever. I recast them anyway.
Stannis and Friends