3. Sienna Miller
Sienna Miller took a four year break after starring G.I. Joe Rise of the Cobra, and although her character was criticized, putting aside how the character was written, I think she was well-suited for the role. She showed she can be quite a devious villain, and had the superior presence to lead the team of villains throughout the movie. These qualities in a positive form are what Wonder Woman needs in order to be fully utilized in the Justice League movie. Miller can certainly bring a commanding presence to Wonder Woman and has shown she can be a charismatic leader that can hold her own in a fight. I would certainly give this casting choice a chance, as I feel Miller could create an appropriate portrayal of the Amazon Princess provided she has a great script to work with. This would also continue the trend of another English casting of a Justice League member (Henry Cavill for Superman, and Christian Bale as Batman, are also English), which would be quite humorous considering they are very popular American heroes.