plinytheelder_t at 2013-10-14 16:28:08:
Maybe we could start from this list: http://www.afi.com/100years/movies10.aspx
or perhaps this list is more relevant: http://www.boxofficemojo.com/alltime/adjusted.htm
I guess the thing I'm really not sure about, which speaks to your "same but different" criterion, concerns a film like Casablanca or Citizen Kane: as great as they are, from a writing point of view, are these movies even relevant to the modern screenwriter? Likewise for any movie made before 1969 (or pick some arbitrary date).
Is there some value in reinventing classic tropes for the modern era, or is the intent to simply treat these movies as markers or shorthand for a more modern film vocabulary?