I love 'Halloween' - the original is just superb, and gave us a lot of great movies that were similar to it.
'The Amityville Horror' is great too - I loved the fact that it was based on the family's true story. It was scary. I wasn't fond of the re-make because the original family recieved no money from that film and it was based on their book, plus the original George Lutz (the actual guy) died while they were filming the re-make from the stress of the court battles. His wife had died years earlier.
'The Birds' is fantastic too - Hitchcock at one of his best IMO. I showed my sister it not long back and she was furious with the open ending LOL. I liked the fact they did something different though.
There's some really creepy scenes in that film for it's age. And did you know they tricked Tippi Hedren into filming the scene where she goes into the attic at the end? She kept asking Hitchcock how they were going to film it, and he said 'mechanical birds' which they'd used for a lot of the scenes. She turned up on set though for the scene and they actually tied the birds to her wrists, ankles and clothing - she said she was terrified and got hurt quite badly, but there was nothing she could do 'cos she was under contract. So her reaction there is completley real. Not very nice in my opinion, but a great shot for the film.
There's no way they'd get insurance to do that these days LOL.