Matched, by Ally Condie

Pretty excellent YA dystopian futuristic love-triangle. In an oppressive, Big Brotherish society in the future, citizens are carefully matched for ideal genetic potential and similarity in tastes and skills, and when Cassia is Matched with her best friend Xander, she is initially thrilled. A technical error, however, leads her to question all she has known, and issues of freedom and manipulation take over the story. Really solid world building and a sinister vibe set this one above the pack of YA dystopias.