Not only does DC have a great property with the Justice League, but many ways of putting the iconic team together. There have been so many great castings and story ideas going around the net. I've decided to do one of my own with the big Three first and a fourth possible member in The Martian Manhunter.
Rachel Weisz/ Diana Prince
I may get some flack for this; However, From the Mummy I & II to Constantine, and now being featured in the upcoming Oz the Great and Powerful. Rachel Weisz is a veteran actress who is still in great shape and no stranger to CBM's. If the focus for the Jl movie is to have a no nonsense Diana. Weisz would be a wise decision. She not only has the look, but a likability to pull off one of the toughest character castings there is.
Eric Bana/ Bruce Wayne
One of the easiest choices to make for me was Bana as Batman. Bana is more than physically capable, but like myself many fans noticed during Hulk, and Star Trek. Eric Bana has shown the capability of bringing out a Dark side that could match the like's of Keaton's version, but the acting chops to match that of Christian Bale.
Henry Cavil/ is Superman
This is a given. To change the actor now would be a waste, plus Cavil looks great as Supes
Peter Mensah/ J'onn Jonzz
This guy rocked in Spartacus. Not much else to say, but slap some green paint and we have our silent but deadly Martian Manhunter.
Now although this fancast may be short and sweet. I don't see a problem with having these four as the only characters to appear in a JL movie first. Following with the idea of having Flash and Green Lantern for a future even bigger movie with Darkseid.