Mista, I wrote all of these a while ago when I last (or first) saw them, so I'd need to revisit the films in order to update my thoughts. But here goes:

La Règle du Jeu (The Rules of the Game)
Booed at its premiere and subsequently banned, this is quintessential French cinema at its most ingeneous. Subtly aggressive, and at times farcical in its satire, it is a delight not to be missed.

Otto e Mezzo (Eight and a Half)
Surrealist nonsense of the highest order, with many visually striking moments.

Shichinin no samurai (Seven Samurai)
Masterful adventure with great characterisation and humour; although the segmented battle reduces the overall impact, and it is unusually long for a film of its tone and kind, it is a bravura display of directing.

Singin’ in the Rain
Lively, inventive comic musical with mesmerising dance and song routines, lots of laughs and brilliant acting; one of the genuine true musical greats.

[I haven't seen Tokyo Story.]