I must say that I think Shane is one of the worst films of all time, but to each his own. My own list of favorite Westerns would be as follows.

1. A Fistful of Dollars, For a Few Dollars More, The Good, the Bad, and the Ugly (Leone)
2. Dances With Wolves (Costner)
3. The Searchers (Ford)
4. The Wild Bunch (Peckinpah)
5. Once Upon a Time in the West (Leone)
6. Unforgiven (Eastwood)
7. Three Godfathers (Ford)
8. The Man Who Shot Liberty Valance (Ford)
9. High Noon (Zinnemann)
10. Rio Bravo (Hawks)