Well, there are quite a few systems out there that can handle bending-like abilities. I think a good place to start is with your experience and intents.
What games are you familiar with? Being a player counts, if you've not run a specific game.
What sorts of things are you looking for in a game, apart from elemental powers? Setting-wise, you're probably not going to find a matched fit, but you can get in the same metaphoric ballpark.