Uglies, Pretties and Specials by Scott Westerfeld

I liked these books a lot, although the style gets a bit much by the third one. It has its own slang you need to learn (bubbly, surge, pretty-making) but the culture is fascinating and it is interesting to think about this as a possible future (as well as see the possible outcomes of our own). If the Giver made you think, you should read these. There is another book, Extras, where everything is like a reality show. Hmmm....