Just read though this thread and noticed there's a split in opinion between casting a quality actor (Gosling is my choice) or a martial artist (Gary Daniels...Ray Park...all touching 40 year old and can't act for ****, poor lads).
I'm just gonna throw this one in the mix - 
Ryan Phillippe.
I rated him in Way of the Gun, Gosford Park and Flags of our Fathers. He's got the look of Danny Rand and he's a black belt in Tae Kwon Do who, with a little training and a good choeographer, could really pull off the action in a film like this.
Just a thought.
Oh, and big up to the maniac 2 pages back who wants Chuck Norris to be in this film!!!