Best novel(s)
The Forever War
Canticle For Liebowitz
Fahrenheit 451
Slaughterhouse-Five
+
Hitchhikers Guide to the Galaxy (OK, so its not
that great but it still makes me laugh
)
Best Series
Dan Simmon's Hyperion Cantos
Asimov's Foundation
Herbert's Dune (the first cycle)
+
Wolfe's Book of the New Sun (though its probably more fantasy)