Fremder--Russell Hoban. As brilliant as Riddley Walker, this book chronicles the psychological dissolution and resurrection of an astronaut whose father's face keeps reappearing after his ship was lost near a black hole.
Godbody--Theodore Sturgeon. Ted's last and almost his best. Jesus returns and straightens out misconceptions about his teachings (and corrects a few neuroses along the way).
Love Is A Dog From Hell--Charles Bukowski. Beautiful, tragic, rollicking, drunk, passionate. "Don't forget your Bach/and your Brahms/and your BEER."
Swastika Night--Katherine Burdekin. Similar to Phil Dick's The Man In The High Castle, but published 25 years earlier, this novel takes place in a world more than halfway through Adolf Hitler's Thousand Year Reich.
The Myth of the Hyperactive Child--Peter Schrag/Diane Divoky. Even though written over 30 years ago, many of its questions are still unanswered, while many of its dire predictions came true.