^^^^^ Mad respect. Once Upon a Time in the West is definitely one of my favourite's ever. I remember visiting my friend at his Uni and we randomly picked some movie out of his roommates box to watch, having never heard of this film before. I was totally blown away by the quality.
Another one of my favourites is the Deer Hunter. If you haven't watched this movie give yourself a free day and do so. It isn't easy or fun to watch per se, but its worth it in the end.