Found this cool website that has fans vote on the ultimate cast for stories that should be made into movies. They have a cool dream cast for Harbinger. I'm not sure how I feel about Channing Tatum playing Sting, I've always seen Sting as more of a Transformers 1 Shia LaBeouf type. Watanabe and Winstead are great choices though.
Director: Joss Whedon
Pete Stanchek/Sting: Channing Tatum
(not the most Pete-like photo but the only one I could find where he had a shirt on!)
Toyo Herada: Ken Watanabe
Kris Hathaway: Teresa Palmer
Not a bad choice.
Faith Herbert/Zephyr: Allison Mack
Could be worse.
Charlene Dupree/Flamingo: Mary Elizabeth Winstead
John Torkelson/Torque: Benjamin McKenzie