Best from Franz Kafka?

I have been reading Jack Kerouac, William S. Burroughs, & Kurt Vonnegut books all this summer & so far I am in love with The Dharma Bums (best book I have ever read) & Junky (awesome book). I really enjoyed Slaughterhouse Five, but not so much Naked Lunch. I've now stumbled upon Franz Kafka- and wanted some recommendations on his "best books" based on my favorites from the other authors.