I'm probably going to incorporate most of what you mentioned into the game. Spiderman has a certain feel, but I've seen him fighting Skrulls with the Fantastic Four.
I know that one of the players is a power-gaming madman and will surely try to be undefeatable.
One is going to be foppish-romantic type.
One won't be able to roleplay his character properly and will do random




and insult NPCs all the time and get his party in trouble cause of the stupidity that he does.
The other...I have no idea. He's been a brave warrior, champion of his elven people (divine champion of Correlan, 1/2 Elf), a crazy berserker dwarven fighter, a not so curious and very calm and illogically logical kender cleric, a random happy go lucky kender thief, a brave dwarven paladin, a cannibal in Wheel of Time (he tried to eat the people he was fighting)...
As you can see, the group is varied. Wait I forgot someone, the other player is almost like he's never there, he doesn't do anything special, he just follws everyone else like a sheep, but he really enjoys being powerful.
What about FCTF and Star Wars??? Mix it a bit with DnD, CoC and Spycraft...and maybe some CoC. That would be very difficult though. But really, the Marvel Universe is a mix of all of those types of games. What do you think would be best for my group?
(NOTE: I have limited knowledge about most of the above games except for DnD, but I have access to all of them)