quite true, it depends upon one's taste
still I feel w/o these someone's collection (or buying or seeing BDs) remain incomplete
1.Schindler's List (yet to release)
2.The Great Escape (yet to release)
3.Apocalypse Now
4.Psycho
5.To Kill a Mockingbird
6.12 Angry Men (Mono sound, so what?? don't you want to see it again and again??)
7.Lawrence of Arabia
8.Ben Hur
9.Bridge on the River Kwai
10.Shining/Gandhi/Chinatown/Once upon a time in the west
well someone may differ which is quite possible, but for me these are must (along with many others) because I will see these every year and will probably ask my children to see these when they are enough grown up, so that means these should survive some 2-3 decades, with all these in mind BDs are best bet, aren't they?
BTW, I liked the expression: nothing is essential in entertainment - quite a good remark