Five books from Germany

Jeff, a Facebook friend, wrote on my Wall:

Which five German books should I read, before I return to Amerika [my translation]?

He seems to read German.  I will recommend: Goethe’s Faust, Rilke’s Duino Elegies or Sonnets to Orpheus, Thomas Mann’s Buddenbrooks, Franz Kafka short stories (don’t forget "Ein Landarzt,"), and Hermann Hesse’s Glass Bead Game.  Non-fiction does seem to count for the query, although it would not crack my list of top five.  Schopenhauer tempts as well.  Do you have better ideas for him?