I haven't seen one of my sci-fi favorites on here, a book that I believe to be on par with "1984" or "Fahrenheit 451", and that's "The Children of Men" by P.D. James. Particularly the opening description of a future world without posterity and therefore without out hope is truly striking. (It should be noted that the film, while quite good, has almost nothing to do with the book). Another thing to consider would be to incorporate some Graphic Novels into the mix. "V for Vendetta" would be a good choice here.