My contract with T-mobile for the original Galaxy S ends in October(I think) and I have no clue as to what I'm gonna do when it actually ends. Kinda want the iPhone 5, but I don't think T-mobile's getting it and I doubt my parents will switch carriers just for me, shame really, will probably be forced to the Galaxy S III in the end, nothing to whine about though, it's a damn good phone as well.
You've never used an iPhone before? If so, you might be tempted to get it because of the Apple hype. Once you start using it, you will be tempted to move out pretty soon (like me). Android is more fun to use, with loads of features/customization. And the SIII is getting rave reviews everywhere I hear about it. Just get it, and probably you will be the next guy raving about it.