I'm not sure if this falls exactly into your category but Farenheit 451... If you haven't read it yet...
Anything by Steven Baxter is good for hard plausible science fiction.
Takes about twenty years to read/understand but jeeez, the author is a genius :o)
Nice one, youngster! Enjoy and also check out anything written by Asimov... also, I have a friend here called literaturegirl, she is a beautiful soul and will guide you towards all manner of incredible reading material. Keep feeding that amazing mind of yours :o)
Childhood's End by Clarke
The Massive, it's a sci-fi comic book about the world after catastrophic climate events mess up the world beyond all recognition. It's pretty realistic.
War of the Oaks by Emma Bull
The Martian is great fun! Also, The Many Coloured Land series by Julian May, have read that three times over. A bit more left field is Piers Anthony Bios of a Space Tyrant... loved them.