Besides GF it would have to be The Man With No Name Trilogy, but I think Leone's 2nd Trilogy (Once Upon a Time in the West, A Fistfull Of Dynamite, Once Upon a Time in America) was quite good, despite Dynamite, which I saw once on TV when it was very late, but didn't like it much.
"I won't be a man like you." - Michael to Vito, orginal Part II ending
