I highly recommend:
Buck & The Preacher-1972, Starring Sidney Poitier, Directed by Joseph Sargent.
Duck, You Sucker!-1972, Starring James Coburn, Directed by Sergio Leone.
A Fistful of Dollars-1964, Starring Clint Eastwood, Directed by Sergio Leone.
For A Few Dollars More-1965, Starring Clint Eastwood, Directed by Sergio Leone.
The Good, The Bad, & The Ugly-1966, Starring Clint Eastwood, Directed by Sergio Leone.
The Great Silence-1968, Starring Jean-Louis Trintignant, Directed by Sergio Corbucci.
Heaven’s Gate-1980, Starring Kris Kristofferson, Directed by Michael Cimino.
High Noon-1952, Starring Gary Cooper, Directed by Fred Zinnermann.
Hour of The Gun-1967, Starring James Garner, Directed by John Sturges.
The Magnificent Seven-1960, Starring Yul Brynner, Directed by John Sturges.
McCabe & Mrs. Miller-1971, Starring Warren Beatty, Directed by Robert Altman.
Once Upon A Time In The West-1968, Starring Charles Bronson, Directed by Sergio Leone.
Pat Garrett & Billy The Kid-1973, Starring James Coburn, Directed by Sam Peckinpah.
The Professionals-1966, Starring Burt Lancaster, Directed by Richard Brooks.
Ride The High Country-1962, Starring Randolph Scott, Directed by Sam Peckinpah.
Rio Bravo-1959, Starring John Wayne, Directed by Howard Hawks.
Shane-1953, Starring Alan Ladd, Directed by George Stevens.
Unforgiven-1992, Starring & Directed by Clint Eastwood.
The Wild Bunch-1969, Starring William Holden, Directed by Sam Peckinpah.
The Man Who Shot Liberty Valance-1962, Starring Jimmy Stewart, Directed by John Ford.