My black+white nominations:-

(1)The Third Man
(2)Some Like It Hot
(3)The Best Years of Our Lives
(4)High Noon
(5)Maltese Falcon
(6)From Here To Eternity
(7)Stagecoach
(8)They Died With Their Boots On
(9)The Lives of a Bengal Lancer
(10)Casablanca

And some colourful contenders:-

(1)Shane
(2)The Quiet Man
(3)Cinema Paradiso
(4)Gandhi
(5)The Bridge On The River Kwai
(6)Unforgiven
(7)The African Queen
(8)West Side Story
(0)Amadeus
(10)American Graffiti

cd.