Grayson makes the most sense, he is just as incorruptible and trustworthy as Bruce but more positive and probably less likely to go down any dark paths that could lead to improper use of the ring. Then again, that lack of negativity may make him unwilling or uninterested in having the ring at all. I really can't wait for them to explore Clark and Dick's relationship in the new 52, which was so strong and such a big part of Nightwing's character before.
Jackman makes a good Wolvie theres no denying that and he is by far Fox's most recognizable Marvel character, so on that grounds alone it makes sense that they would try to get him into as many movies as possible. This is sounding better and better. If they actually stick close to the real story, this is gonna be a good movie.
Sure Ninjak and Manowar are a great team, but try to imagine them taking on the duo directly above them and winning.....no I can't imagine that happening either. Hulk and Iron Man are too damn good for practically anyone.
I think he actually has a vendetta against Kryptonians and the house of El. He probably feels like Jor El screwed him over on purpose.After all, his rocket barreled through stars and black holes, while Kal's made it to Earth with no problem. The symbol probably was self inflicted as a mark of his vengeance against the hosue of El.