Duel was indeed Spielberg's first.. one of the great plot devices was he never showed the driver. It was as if the truck itself was the villain. Its an intense movie!
Im going to take an unpopular stand (rare for me i know)... the abyss was abysmal. I like the first 3/4 of it but the end was the laziest most poorly written nonsense i have ever seen. It ruined an otherwise good movie. Had to get that off my chest.
Saw is an interesting nominee. It was indeed small budget horror and was so popular it spawned a series. Im not huge into the gore franchise but it was a movie that captured my interest and kept you hanging on till the end to see the resolution...