#1 Tombstone
#2 Open Range
#3 Silverado
but 2 and 3 are pretty close. The cinematography of Open Range is some of the finest I've seen not put out there by Edward Zwick (yes, I know he's a director and not a DP - but all his movies are so beautifully shot). And the scattershot style to the gun battle at the end is incredible. A bit like Saving Private Ryan in the old west. Not as consistently intense, mind you, since there are so many fewer combatants in OR, but damn good all the same. I guess maybe you can compare the camerawork in the gunfight to some of the fighting sequences in Enemy at the Gates... when it's intense, it's really intense; and then there are the suspenseful interim sequences. You've gotta see this movie.