My ten in no particular order - though I could sub any one of these films for at least a dozen more!
The Good, The Bad and The Ugly
The Terminator
Das Boot
Cape Fear (1991)
The Lord of the Rings: The Fellowship of the Ring
Dr Strangelove: Or how I learnt to stop worrying and love the bomb
The 'Burbs
Flash Gordon (Vastly superior in every way to Star Wars)
The Thing (1981)
Jurassic Park
Edit: The dates