Haven't been on here in forever. I do heartily agree Jensen Ackles could pull it off, but I have another name to throw into the hat (that gets tossed in the ring, that gets swallowed up in the black hole of Hollywood, whilst slowly sucking the soul from my favorite fictional character). But hey I'm not bitter or anything
Anyhoo, this gentleman starred in and co-wrote a little gem of an independent film called "The Prodigy". His name is Holt Boggs, and he, IMHO, could really pull it off. You should definitely check out the film, there is a magnificently brutal fight scene between Holt and the bad naughty assassin fella that will jar the teeth in your skull. Not sure if Holt has any martial arts training, but he can throw one hell of a punch, and shows off his pugilistic skills throughout the film. Some of the most realistic fight scenes, and great sound effects to go with them. Plenty of gunplay too, I think all you RJ fans would enjoy the film if you haven't seen it already. Can't remember how to attach pics or I would, see IMDB or holtboggs.com or just rent the film
...just my two cents.