First off I'm going to start with....
either....
Brandon Routh as Superman
or Josh Hartnett as Superman
Well IMO Superman is about 6'2-6'3ish and Hartnett is 6'2 plus the fact i think he's a great actor
Christian Bale as Batman
Katie Holmes as Princess Dianna/Wonder Woman
Ryan Kwanten as The Flash
Ryan Reynolds as Hal Jordan/The Green Lantern
Josh Holloway as Oliver Queen/Green Arrow
Sarah Michelle Gellar as The Black Canary
Elisha Cuthbert as Kara Zor El/Supergirl
Daniel Craig as Dr. Fate
Jeffrey Dean Morgan as Lobo
Michael Fassbender and Arthur Curry/Aquaman
David Boreanaz as Captain Atom
Sean William Scott as Booster Gold
Serinda Swan as Zatanna
Laurence Fishburn as John Johnzz/Martian Manhunter
Mark Wahlberg as Hawkman
Jonathon Rhys Meyers as John Corben/Metallo
Just a really creepy guy in my opinion.
Michael Ironside as Darkseid (Voice)
Billy Zane as Lex Luthor