A lot of my favorite films are B&W. In fact, Orson Welles NEVER directed a color film! He acted in color films, but never directed one himself; "Citizen Kane", "Magnificent Ambersons", "Touch Of Evil" et al, all in B&W. He believed color only got in the way of film drama, and in his will stipulated his films NEVER be colorized.
Of course, film noir was made for B&W. Two noirs I'd LOVE to see on DVD are "Nightmare Alley" (great performance by Tyrone Power and the photography rocks!) and "Kiss Me, Deadly", which I've only seen on videotape (it'll knock your eyes out!)
Two of my favorite 70's B&W films are "Young Frankenstein" (Mel's masterpiece!) and "Paper Moon" (which IS on DVD!)
Many westerns are great B&W films, such as "Yellow Sky" (a superbly photographed William Wellman western, not to be confused with the Stephen Crane classic "The Bride Comes to Yellow Sky") and Sam Fuller's "Forty Guns" (Barbara Stanwyck sizzled in that one!)
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Terry Bigham