4. Ben Barnes
32 year-old English actor Ben Barnes is another relatively unknown, whose biggest films include The Chronicles of Narnia: Prince Caspian, Dorian Gray, The Chronicles of Narnia: The Voyage of the Dawn Treader, and The Big Wedding. He would need to bulk up for the role, but we've seen time and again that Hollywood trainers are particularly good at making actors pack on muscle. He looks the part, and I've seen his name pop up again and again on fan sites and blogs when discussing the role. He's also a bit of an newcomer, which is important for a supporting role like this. His work as Prince Caspian in the Narnia series shows that he can play a conflicted, action-oriented character amongst an ensemble cast.