Classics that I've read are Paris in the Twentieth Century by Jules Verne, Justine by the Marquis de Sade, War and Peace by Leo Tolstoy and The Basic Writings of Nietzsche by Friedrich Nietzsche which is a collection of Nietzsche's best books, essays and a section of aphorisms.

As for books I read repeatedly...there are so many.

Right now I'm finishing All Tomorrow's Parties by William Gibson which is the third in a trilogy preceded by Idoru and it's prequel Virtual Light. I also can't get enough of Dan Brown's books especially Digital Fortress--an excellent book. Joseph Finder's Paranoia and Company Man about corporate espionage are both great reads with awesome endings.

The Great Winter trilogy by Sean McMullen is a very unique story with well developed characters. This is one of those stories where you love one character and can't stand another, then things change and the character you were rooting for becomes the villain and the a*hole turns out to be good. Great read, I highly recommend it. The titles are Souls in the Great Machine, Miocene Arrow, and Eyes of the Calculor.