Hmmm... If it's "Modern" City, somehow I think it should probably be kind of... Progressive, if that makes sense?  Like, all shiny and high tech and not having much in the way of slums and social divide and stuff like that.  Might be interesting to make it so that there wasn't much in the way of crime or tension before the accident, too, and have the meta-humans serve as a catalyst for basically all the potential drama of the RP.

Just an idea though, I guess. ^^;