http://www.pulp-city.com/
Play this game with two or three guys, to a faction of a half dozen or so. They have everything in there, plus have ways you can add in your own, or use your own "Superheros stuff."
I have a few of these guys that will be my first project when I get back to the house.
The superheros/ villians have some powers, you use dice to get it on, they have cards with the stats and stuff on them. You can use as much or as littl as you want and the modeling options are amazing.
Good game, plays fun, and the options are all there. I even use some
DC guys once in awhile for laughs.