Watching Jax play the Steelers at least once (sometimes twice) a year, I'd have to say they are the most physical team in the league. Their D is hard hitting and their O is a pounding run O. Very physical, entertaining games.
As far as other teams, I can't really think of any other teams that haven't been mentioned. I think the OP got it right with Pitt, Jax, and Balt are the three that would pop to mind right away.
Feel small yet?