I'm all about dystopian YA right now and I highly recommend Uglies by Scott Westerfeld. It really forces you think about how appearance effects behavior and perception. The fact that this novel is YA is particularly good because when you're a teen, it can be challenging to feel confident about your appearance. But there's more to to the story than that. It's all about perception, the value of friendship, how our appreciation of beauty has changed over the centuries and there's a darn good adventure wrapped up in there too.