It's supposedly between the guy from Twilight and the guy who plays Beast. Those both sound bad to me. The Twilight guy ALWAYS looks like he needs to take a shower even when he's in a $5,000 suit. The guy who plays Beast seems too soft. Who would you pick?
Here are my picks regardless of age: Richard Madden (Robb Stark), Matt Bomer, Eric Bana, Jon Hamm, Josh Brolin, or Dan Stevens. It depends on the story, time frame, and tone.