Nominations to play Reacher: Brock Lessner.
I think the guy that played the Comedian in Watchmen could do it if he bulked up. http://www.imdb.com/name/nm0604747/
I don’t see Reacher as overly muscled. He is just tall and big. Cruise is short and buff, but that won’t make Reacher. That and the stupid grin he has. I have a feeling that Reacher doesn’t grin to often.