>>35176For a Few Dollars More is arguably the best of the "Dollars" series, which often is associated with Once Upon a Time in the West and Duck You Sucker / Fistful of Dynamite.
Fievel Goes West is like a fever dream, especially with the context of the original American Tail movie clearly taking place in the 20th century and having a much more serious tone. That kind of heightens it to feeling mythic. It's also notable for having Jimmy Stewart's last role.
>>35371The Coen version of True Grit is great. One of the few times Matt Damon is used well in a more recent movie, where he feels like an actual character in the world and not milking star power. The whole cast is perfect and it nails the nihilistic tone it's going for.
High Plains Drifter is a classic and one of Eastwood's first films as director. It really leans into the surrealism and mystery without going full gonzo like El Topo or something. Dead Man is kind of similar to that but more restrained, it feels like it works on an almost "fairy tale" logic but also has the nihilist/absurdist tone perfect.
Shanghai Noon gets points for Chinese representation in the West (surprisingly not a lot of examples despite the rich story potential as well as the large Chinese movie market today). Only other example that springs to mind if Blazing Saddles which I'm kind of surprised nobody mentioned yet but maybe it's just too low-hanging fruit. It's also more of a Hollywood-meta parody film than a western anyway, so maybe it doesn't count.