OK.  As a former film critic and filmmaker struggling still in obscurity, here's my offering: LA DOLCE VITA (1960) by Fellini.  True, L'AVVENTURA may be more artful, and a dozen others more austere and rigorous, but Fellini's moment never wears thin for me, and I return to it year after year to study faces, moments, compositions, and music cues.  Plus, I just never get weary of looking at either Anouk Aimme or Marcello M in their youth.