11. Ben Foster
One of the most under-exposed young actors today, Foster has become one of Hollywood's best character actors in recent years through his roles in 3:10 to Yuma and the Messenger. Foster brings a certain intensity to all his roles that would be a welcome change to the laid back approach used in the last few Star Wars movies. Foster gained experience in sci-fi when he starred in the 2009 film Pandorum. While it received mixed critical acclaim, Foster was excellent in it and I thought it was one of the more underrated movies of recent years. Being cast in a Star Wars movie would be a chance for him to showcase his abities as an actor to a larger audience. Foster is good at playing the slightly insane villain, as he did in 3:10 to Yuma, and so would be best as a supporting villain.