Martian Manhunter picks:
Keith David has done a lot of voice work like the Arbiter in Halo 2 and narrated the Bible on the History Channel. Played Admiral Anderson in the Mass Effect Games. He played live action Max Malini in the Cape.
Lance Reddick was on Fringe
Adewale Akinnuoye-Agbaje played Heavy Duty in the first GI Joe movie and Mr. Eko in Lost.
Hawkgirl is like Wonder Woman but less controlled. She like a Marine. She always wants to fight. I know her mostly from the Justice League Cartoon.
...The Wonder Woman Picks:
Gemma Arterton - She's got these Giant Anime eyes too and I think she looks the part.
Serinda Swan - I dont know her work too much except she played a Siren in Tron Legacy and i saw her on Supernatural one time where she played a greek goddess Veritas. Also she played Zantanna in Smallville.
Bridget Regan (Prob one of my favorites) From Legend of the Seeker. I think she has the look and the action chops. She's prob the internet front runner right now.
Lynn Collins (Another of my Favorites) From John Carter of Mars. She was basically playing wonder woman in that movie right?? She was also in Xmen Origins Wolverine. Though the movie wasnt great, she was one of the few good things in it.
Malin Akerman, of course played Silk Specter in Watchmen. Got the acting and the action, though idk how well she gets the wonder woman look down.
JENNIFER LAWRENCE, Granted she's young but she can play anything you throw at her and shes the most popular rising star right now. I think she could do something Awesome with it.
Zoe Saldana (I am a big BIG fan of a more international racially diverse wonder woman and Zoe is heavy on the acting and action and could hold her own next to the man of steel and the caped crusader)
Sarah Lancaster (From Chuck) She's got the look and the acting chops but Im not sure about the action part.
Angie Harmon, def has the action part down and the acting chops, but the casting might be skewing a little younger. plus She looks a little too much like Jamie Alexander (Sif from Thor) who is another internet favorite but Im just not seeing it.
Priyanka Chopra (One of my favorites because shes so international and I have a soft spot for Bollywood movies) She's a dancer so she could probably handle the action, she def has an amazon sort of look.