I think I've just found my natural home on MN after a these years 
I've skimmed the thread and I don't think anyone has mentioned:
Riddley Walker by Russell Hoban - post-apocalypse dystopian novel written in a fully developed dialect of its own. Absolutely glorious.
Spares - Michael Marshall Smith - like Never Let Me Go
Never Let Me Go - Kazuo Ishiguro - glorious and beautiful story
A Canticle for Leibowitz - awesome
Girlfriend in a Coma - Douglas Coupland
Specimen Days - Michael Cunningham
Children of Men - P D James
The Unit - Ninni Holmqvist - a must read, beautifully translated
I really love post-apocalyptic, counter factual, dystopian type fiction, usually the more grim, the better 
I have bookshelves dedicated to this kind of fiction but they're all jumbled up after my house move. I used to love Anne McCaffrey when I was a tween and I liked David Eddings (highly recommend as YA reading).
I have most of the classic 50s stuff but I'm having surgery next month and will be at home for at least 3 weeks, so I must find something engaging to get stuck into!