Straw Dogs is very, very good. It is directed by Sam Peckinpah and stars Dustin Hoffman.
It's a film about a young couple that move to the English country side. There marriage begins to test the fabric of what each can stand. Harsh things happen, and in the end, Dustin Hoffman's David chooses to take on the villagers in a violent confrontation of territory.
Somewhat of a spoiler, so SPOILER ALERT!
The film is also famous for a brutal rape scene that led many to say the film was offensive in it's violence and Pauline Kael even called it fascist, though Sam Peckinpah disagreed completely.
The new Criterion DVD is very good. (
http://www.deepdiscountdvd.com/dvd.cfm?itemID=HVD001597) I'd recommend renting it before spending that kind of cash on a film that could not be your cup of tea, but I'd still see it. In my opinion, it's one of the best films of the 70's. It's a lot slower and intellectual than some make it out to be, but it's still trademark Sam Peckinpah.