I watched "Island in the Sky" recently. Don't like it much. My favorite Duke movie is "The Quiet Man." His most poignant movie was, of course, his last, "The Shootist." My favorite movie star ever is the great James Stewart, and the Duke is my #2 favorite. The best movie they made together was "Who Shot Liberty Valence."
"The Shootist" and "The Man Who Shot Liberty Valance"--two of my all time favorite movies! Wayne couldn't have picked a better movie to end everything on than "The Shootist". It's perfect.
All the Ford/Wayne pics are the best IMHO...but if I had to narrow it down to 3 it would be, Quiet Man, Liberty Valance and The Searchers(I think my fav).....I'll check out Walmart and pick those two up, although after watching them again recently, they are not near as good as I remember them...