Right now i'm reading Blood Meridian by Cormac McCarthy:
http://www.amazon.com/Blood-Meridian.../dp/0679728759
It's an American Western loosely based on historical events, namely the
Glanton gang, which was a group of scalp hunters who were contracted by the Mexican and American government to clear Apache and Comanche Indians from the Texas-Mexico borderlands in the 1850's. It's a really good book. The only thing that's kind of annoying about it is you need to keep a dictionary next to you when you read it because he uses a lot of archaic words from the historical setting of the story.
Next up on the list is Memoirs of an Infantry Officer by Siegfried Sassoon: a British Infantry officer who fought in WW1 on the Western front. Then it's Slaughterhouse Five by Kurt Vonnegut.