Arthur Rex -- Thomas Berger
An American Tragedy -- Theodore Dreiser
Absalom! Absalom! -- William Faulkner
Mason & Dixon -- Thomas Pynchon
Voss - Patrick White
Any other novels by these writers are also great.
I especially recommend Thomas Berger who is the best living American novelist in my opinion, and ranks with Faulkner and White as the best writers in English of the 20th century (ymmv).
Brian