I watched Prince Caspian the other day, it was on TV (can't wait for the next movie) and i think that Ben Barnes would make a good Rushton! He has the right face for.
he is not an actor, but a person I know. This is almost exactly how I imagined rushton, and I seemed to unconsciously fuse this gentleman's face into my imagining of Rushton.
I't's the folded arms that does it. He's only 17-18, so as he gets older, he'll look more as I imagine rushton to look as he gets older.