Witchcraft (especially with the Mystery and Abomination codices) was just about everything I liked about The World of Darkness with none of the stuff that I hated. While I can't really get excited about Classic Unisystem now (Cinematic Unisystem ruined Classic for me), there is still an amazing amount of content in those three books. Fun fact: I pitched a faction book for The Fellowship of Judas, but was turned down (mostly because I had no idea what the Hell I was doing at the time).
Witchcraft is available for free at RPGNow, so check it out.
While you are there, get Heaven's Shadow and Fate Core, which would be the other two games on my list (mostly trumped by Witchcraft because I have actually ran Witchcraft before).