3-10 to Yuma
Tombstone
The Quick and The Dead
Dances with Wolves
I haven't seen any of the 'real' Westerns, but I found these 4 to be pretty good
Tombstone and Dances are "real" Westerns if you were wondering.
Also add to your list Open Range, Appaloosa, The Assassination of Jesse James By The Coward Robert Ford and The Man From Snowy River are the more modern well done westerns.
If you want the old light hearted western try The Man Who Shot Liberty Valance, Rio Bravo, and El Dorado.
Good dark westerns are The Man With No Name Movies, The Magnificent Seven, Unforgiven.