It was tough for me to vote as well and its my poll. The proposition, The Assassination of Jesse James and unforgiven were neck and neck. I did a coin toss and Jesse James won which is the only reason I voted for it.
I also really enjoy django and tombstone but not as much as those other 3
I love the Coen's remake of True Grit, and several of those are quite good, but only one is a bona fide all time great western in my eyes, and that's Unforgiven. Up there with the work of Ford, Leone, and Peckinpah. The next best film is a distant second.