Great question, bednobs.....
For me, it has to be The Shawshank Redemption and the way it's story is told.....brilliant acting all round.....remember seeing this at the Fairfield Halls in Croydon, on a very limited cinema release, as it was not given a large cinema outing, as I recall, but went on to be a top video rental and seller, and achieved bit of a cult status.
Superb movie. I have it proudly sitting amongst my Blu Ray collection.
Song of Bernadette and Jaws also deserve a mention.