A "spaghetti Western" is more of a concept than an acutal film. Plenty of Eastwood "spaghetti westerns" appeared that had the look and feel of Leone, but were made by American directors. Witness "Shane" "Josey Wales" "Hang 'em High" with Pat Hingle as the judge, etc...etc...

Some of my other faves include:

"The Magnificent Seven" with Yul Brynner, Eli Wallach, Charles Bronson, Steve McQueen, Robert Vaughan, James Coburn, and Horst Buchholz

"High Noon" with Gary Cooper, Lee van Cleef, Lloyd Bridges, Grace Kelly, Harry Morgan and Lon Chaney Jr.