Karl Urban as Clark Kent/Superman I picked Urban because he is a great actor and displays a look of a hero and could also appear as a nerd with glasses. He has done a couple bad movies but never acts badly and he is a fan favorite for many CMBs but I think he would be best for this. He is powerful and dramatic and not too overly used.
Ethan Hawke as Batman/ Bruce Wayne This guy is a great actor with a very good look for Bruce Wayne. He has had some great roles in the past that solidify my reasoning of this. He was great in Gattaca and Daybreakers and would be great opposite Karl Urban
Olivia Wilde as Wonder Woman Wilde is a great actress with a lot of potential. She has a hot amazonian look, and if she gained some muscle, she could pull off the role effortlessly.
Justin Bartha as Barry Allen/ The Flash Bartha has portrayed many comedic characters in the past that make him great for this role. He also has a type of nerdish cool look that would make him great as a scientist turned hero.
James Cavizel as Hal Jordan/Green Lantern I know Renolds has already been picked for this, but if he was to be replaced, Cavizel would be a great replacement. He has a very manly and serious look that would be great for the pilot side, and could be a hard ass galactic cop as well.
A great strong actor with a great body and voice for Martian Manhunter. Although he is good for Black Panther, he could also make Martian Manhunter a great character. With some make-up and a bit of CGI for facial features, this guy would be perfect for the role.
Ewan Mcgregor as Oliver Queen/Green Arrow I know I say this pick a lot, but I know he is the best for Oliver Queen. He has been in many great movies to prove his acting ability, and has the look of a rich man with a night life as a crime fighter. He could pull off this role effortlessly.
Sienna Miller as Dinah Lance/Black Canary Sienna Miller is the perfect choice for Canary. She is damn hot and has a small history in action flicks, that would make her great for this. She would also make a great girl-friend for Green Arrow.
Keifer Sutherland as Orin/ Arthur Curry/ Aquaman Sutherland is a great tough actor with a past of great roles. He would be perfect for the king of Atlantis, and a human hater.
Thomas Jane as Katar Hol/Hawkman Jane is a tough actor with a great warrior look for Hawkman. He was in Punisher and needs to be back in a CBM, and he would be great in this role.
Eliza Dushku as Shayera Hol/ Hawkgirl Dushku is hot as hell and would look great in Hawkgirls suit. But aside from just being hot, she has a history in action roles, and would be great wielding a mace. She would also look great side-by-side with Thomas Jane.
Sophia Bush as Zatanna Zatara Damn, how awesome would it be to see this girl in Zatana clothes. She is also a great younger actress that would be able to be better than the girl that portrayed her in Smallville.
Michael Rosenbaum as Red Tornado Let's face it, this guys going no where in his career. Sad, but true. To make a great return he needs a great movie. If he was in Justice League, being the wise and powerful Red Tornado, I bet some more roles would open up for him. He has the right voice and role for this role.
Ryan Phillippe as Hector Heywood III/ Steel A great young actor with the right look and personality for Steel.
Michael McPartlin as Michael Jon Carter/Booster Gold If you've seen this guy in Chuck, you knows he's right for Booster Gold. He can play a funny character and a strong character, just what Booster Gold needs.
Mathew Fox as Ray Palmer/ The Atom I'm not a huge fan of Fox. In fact I hate the guy, but he does have the scientist look and hero look for this role.
Mila Kunis as Huntress She's a fan favorite and a great pick for it.
Sam Witwer as Shazam I know this is a different choice, but the guy looks just like Shazam, and he has the personality for it as well. If he bulked up, he would fit the role perfectly.
Elias Koteas as Phantom Stranger He has the look and attitude for the role. There is no other CBM role I could see this guy in ,and he's perfect for this.
Clive Owen as Kent Nelson/Doctor Fate Clive Owen is a more than established actor, and his voice and talent behind that suit would be perfect.
Jensen Ackles as Nathaniel Adam/ Captain Atom I know this is a very over picked actor, but there is truely no better DC role for him. Captain Atom is one of my favorite heroes, and I couldn't see anyone better. And for those who loved him for Captain America, this role is quite similar.
Josh Holloway as Elongated Man Never been a fan of this actor either, but for this role he is perfect. He is a strong and funny actor, and perfect for Elongated Man.
Wilmer Valderama as Paco Ramone/ Vibe A great actor with the right look and personality for this role. He needs beter roles and this is the perfect one for him.
Bradley Cooper as Guy Gardner/Green Lantern Who else?
Ashton Kutcher as Wally West/ The Flash I know many will hate this pick, but hear me out. Ashton has proven himself in some great serious roles, and has the comedic part in the bag. No one is better.