The Searchers has to be 1st.I would have to include The Man Who Shot Liberty Valance in place of Grapes of Wrath. I read Maureen O'Hara's Autobiography recently,she had a VERY strange relationship with John Ford,especialy during the classic Quiet Man!
I find the humour to be too broad in Liberty Vallance. And in the flashbacks James Stewart is supposed to be a young man, but he is clearly in his fifties. The film looks good, though.