Ironman comes to mind. Captain America is, in my mind, the most notable exception.)
I was pleasantly surprised by the noble Bruce Wayne of The Dark Knight Rises. (Yes, I just now got around to watching it.) His choice to take a bomb away from Gotham and seemingly die for the people caused my chest to swell with admiration. That, my friends, is what being a man is all about. The fact that he survives does not in any way diminish his heroism. Thanks, Christopher Nolan, for giving us someone to look up to. Can't wait for Man of Steel!