For Whom the Bell Tolls is a classic and I think Hemingway's best work. I cannot recommend it enough and if you have it sitting on your amazon wishlist, do yourself a favor and purchase it.
I just finished "The Spy Who Came In From The Cold" by Le Carre. Fantastic as expected. One of the great spy thrillers.
Currently reading "Never Let Me Go" by Kazuo Ishiguro.