Just finished The Portable Nietzsche edited and translated by Walter Kaufmann. It's about 700 pages and can be grueling at times but is also very rewarding. The book contains most of Nietzche's most famous works including Thus Spoke Zarathustra, Twilight of the Idols, The Antichrist and Nietzsche contra Wagner. It also contains some of the philosopher's letters and aphorisms. If you're interested in existentialism and re-examining your views on the world it's definitely worth a look.