i suggest signing up for hulu+ and going through some of the films on there first. most of the movies are on hulu+
Or you can blind buy.. criterion products tend to hold their value on the used market very well.
my picks would be Umberto D., Bicycle Thief, 8 1/2, Seduced & Abandoned, Youth Of The Beast, Pandoras Box, Modern Times, Le Trou, Antichrist, Billy Liar, The Horses Mouth, The Soft Skin, That Obscure Object Of Desire, Nights Of Cabiria, BRD Trilogy/Veronika Voss, Brazil, Exterminating Angel, Stolen Kisses, Hidden Fortress, Rosemary's Baby, M, The Fallen Idol, Mafioso, Underworld, The Last Metro, The Fire Within, Notorious, Solo Con Tu Pareja, Murmur Of The Heart, La Notte, L'Aaventura, Pickup On South Street, Rashomon, Forbidden Games, The Fugitive Kind, The Killing, Bob Le Flambeur, Breathless, Band Of Outsiders, Killers Kiss, Viridiana, Videodrome, Rushmore, Royal Tenenbaums, Blow Out, Contempt, Mississippi Mermaid, Being John Malkovich, Story Of A Prostitute, Third Man, 400 Blows, Fear and Loathing, Unfaithfully Yours...
I could list more, but these are solid 5/4 stars for me
Yeah, pretty much seen every criterion dvd/laserdisc/blu and am almost done with everything in the hulu catalog.