Don't think anyone has mentioned 'Brief Encounter' so far - Noel Coward, David Lean, Rachmaninov, Trevor Howard, Celia Johnson - pretty much a perfect film imho
.
I'd also recommend
The Big Lebowski
Silent Running
Branagh's 'Henry V'
Olivier's 'Richard III'
... and anything with Louise Brooks in it, primarily because it has Louise Brooks in it
- especially 'Pandora's Box' and 'Diary of a Lost Girl'.