My choice is ALL THE PRETTY HORSES, by Cormac McCarthy. I actually can't say if the entire book is not as good because I haven't made it past page 10. I cannot read it, no matter how hard I try. There are no quotation marks! I may not be the biggest fan of experimental writing, but that type of experimentation just fails on me. There are also some incredibly long sentences. One is 13 lines long! By the time I've forced myself to read every word, I forgot the first 5 lines and couldn't tell you the noun or verb.
The movie was great, though. Lots of imagery, powerful characters and a fascinating time in Mexico/US history.