2. Batman - Brad Pitt
Brad Pitt was the 90s, so it only makes sense that he should portray the superhero of the 90s. Able to play charm off-the-cuff, and yet be as serious and dark on the flip of a dime, Pitt had all the star power and looks necessary for an effective Bruce Wayne. And, let's admit it, you wouldn't have minded to see what he would have done with the role. He was physically capable and would even get to boast to best friend George Clooney that he played the part minus the nipples. Pitt would obviously headline this crew, and his name would have brought in the big numbers into the box office. And after seeing his excellent duel with Eric Bana in Troy, I'm very much on board with the idea of seeing Pitt take on a whole lot of ninjas with Superman backing him up. And speaking of Superman...
Alternate: Eh, give Clooney another shot.