For days when you'd like to get away from it all for a bit:Master and Margarita(some of the best Russian fiction, the kind of book that stays with you long after you're done) andSandman(not a novel, shoot me, but it's worth a read for the dreamy atmosphere and the incredible art).
I'd also be remiss if I didn't mentionNo Longer Human by Osamu Dazai; it's an incredibly emotional Japanese coming of age novel about a person who's haunted by the realization that he doesn't quite fit in with his peers.