Well, Fellini and Bergman were two of the biggest foreign box office draws in those days (60's to 80's), along with Truffaut and Kurosawa as foreign directors who could always be counted on to do good business in the states. I wonder what is so accessible about their films? Anyway, for Fellini I would say "8 1/2" is his seminal work, along with "La Dolce Vita", "Nights of Cabiria", and "La Strada". Many people critizized Fellini afer "La Strada" cause they felt he was betraying his neorealism roots and was becoming outlandish with 8 1/2 and "La Dolce..." Watch and compare to see which you prefer. As for Bergman, I'd say "Cries and Whispers" is his best, never has there been a more poetic or direct statement about morality, death as pain, and the need for love. Just an extroadinary piece of work. You'll never forget it. "The Seventh Seal", "Persona", "Wild Strawberries" and "Smiles of a Summer Night" are important too I'd say.