With any comic book movie, I think it is imperitive to collaborate with definitive writers of the respective characters' comics a la Sin City.
A Wonder Woman movie should have heavy involvement with Greg Rucka, as he's the best Wonder Woman writer at present. A Green Lantern movie with either Geoff Johns or Darwyn Cooke. A Swamp Thing/Watchmen with Alan Moore. A Batman OR Superman movie with Jeph Loeb. An X-MEN with JOSS WHEDON!