True, I've actually given it some thought and I think maybe I should re categorize my top 10 to rightfully include Morricone, I'm honestly letting my love for the other composers cloud my judgement here.
Also I'm glad that you threw in a such a different score. Benedetto Ghiglia definitely turned out some interesting scores, and it's nice to see him get recognized. Un Dollaro Tra I Denti and Adios Gringo were among the best of his works in my opinion. I'd rate Un Dollaro Soltanto (the chorus version of I Falso Soldato) as my favorite piece of the soundtrack.
I'll be honest though, while I do love the score very much, and while it is very fitting to the movie. I'm not a fan of how much repetitive the score is. After listening to the Japanese release the main theme (Il Bandito Messicano) is presented without much variation, and dominates the films score. It is possibly a factor of how quick the film was made though. But I lament that the score could have been much greater with the addition of yet more I Cantori Moderni.