This is the list of books I put together a few weeks ago to help my snap out of my funk. There are sure to be some on the list you'll enjoy (it's a mix of apocalypse, sci-fi and fantasy). Of course I'm in the middle of reading The Hunger Games now

Black Easter by James Blish
A Canticle for Liebowitz by Miller
Non Robot/Foundation Asimov
Dueling Machine Ben Bova
Any of the earlier Pern books
Friday by Heinlein
John Campbell
I, Zombie by Curt Selby
John Crowley - Little, Big
The Heechee saga by Frederick Pohl
Octavia Butler's Xenogenesis
The Parafaith War by LE Modesitt Jr.sci-fi
Rediscovery of Man by Cordwainer Smith
Solaris by Stanislaw Lem
David Gerold, a bit in the vein of Heinlein's short story, "All You Zombies"
Hyperion by Dan Simmons
Olaf Stapledon's "Last and First Men
The Sirens of Titan by Kurt Vonnegut
The Fifth Sacred Thing - Starhawk
H. Beam Piper's Federation
Riddley Walker - Russell Hoban
Stand on Zanzibar - John Brunner
The Lilith's Brood series - Octavia Butler
End of eternity - Asimov
Babel-17 by Delaney
A Gift Upon the Shore by M. K. Wren
Finder, Bone Dance and Falcon, by Emma Bull.
Time Considered as a Helix of Semi-precious Stones - Samuel R. Delany
Michael Moorcock - Corum, Elric
The Witches of Karres, by James Schmitz
The Last Planet, by Andre Norton.
C. J. Cherryh - Morgaine
The Chronicles of the Deryni, by Katherine Kurtz.
Fritz Leiber's The Big Time
The Family Tree, by Sheri Tepper
The Musashi Flex series
Andre Norton - The Stars Are Ours, 2250 AD
Scott Westerfeld's The Risen EmpireSilk Roads
Shadows, by Susan Schwartz
Harlan Ellison - "Phoenix Without Ashes"
The Stars My Destination by Alfred Bester
The Demolished Man, also by Alfred Bester.
L. Sprague de Camp - "Lest Darkness Fall
All The Myriad Ways by Larry Niven
Godstalk, by P.C. Hodgell
Jericho Moon, by Matthew Woodring Stover
Heroes Die, by Matthew Woodring Stover
The Face in the Frost, by John Bellairs
Gloriana, by Michael Moorcock
Magic Casement, by Dave Duncan
The Overman Culture, by Edmund Cooper
The House in November, by Keith Laumer
Re-birth (AKA The Chrysalids), by John Wyndham
Hawksbill Station, by Robert Silverberg
Children of the Star trilogy, by Sylvia Engdahl
The Changeling, by Zilpha Keatley Snyder