Originally Posted by Holden Pike
Hombre (1967) starring Paul Newman and Richard Boone should definitely be on your to-see list as well, and another oft-forgotten great modern Western is Lonely Are the Brave (1962) with Kirk Douglas and Walter Matthau. Budd Boetticher has a group of stark and psychological Westerns including The Tall T, Ride Lonesome, Decision at Sundown and Seven Men From Now (all starring Randolph Scott), and Anthony Mann has a bunch of offbeat good ones to seek out too, including The Man From Laramie, The Naked Spur, Bend in the River, The Far Country and Winchester '73 (all starring Jimmy Stewart in non-comedic mode) and The Tin Star with Hank Fonda & Tony Perkins.

Of the films you mentioned above, I've seen The Man From Laramie and The Far Country. I liked The Far Country better, but probably only because Walter Brennen is in it.
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NEW (as of 1/24/05): Quick Reviews #10
NEW (as of 1/24/05): Quick Reviews #10