those of you who've listed the killing of a chinese bookie should try to watch mikey and nicky if you can. it's arguably the superior cassavetes movie of 1976, with the caveat that elaine may (an excellent director in her own right) directed it rather than cassavetes himself. it stars cassavetes and falk as a pair of, let's say, down-on-their-luck mobsters.
de palma also did two movies that year, so those who listed carrie should maybe watch obsession as well. i haven't seen it but i know it's very well liked.