Because I so thoroughly enjoyed numerous Young Adult books (The Stars In Our Eyes, Hunger Games, One Day), I decided to go on a YA reading spree.
The novels that really spoke to me were Delirium and Matched. They're superficially similar: both dystopian romances, with curfews, marriages made by the authorities, and heroines who like running. However, Delirium is more complex, written in an almost poetic language, full of symbolism and twists. Not that Matched isn't an excellent read, though perhaps for a younger audience.
(Divergent left me underwhelmed by the writing style, though I did appreciate the originality of the idea.)