Alien - great.
Mulholland Drive - hate it. Maybe it's just the name, but I'm always inclined to think that Sunset Boulevard did everything this does but better, and without all the inane Lynch weirdness.
Sunset Boulevard - speak of the devil. Terrific.
Reservoir Dogs - one of Tarantino's more tolerable films.
Rebecca - pretty good, although parts are a little tedious and the ending is weak (ruined in part, no doubt, by the censors). But Joan Fontaine is quite good and the Mrs. Danvers stuff is all great. I might prefer Secret Beyond The Door for this sort of thing, or, slightly further away, Gaslight or I Walked With A Zombie.
Stagecoach - very good - great cast and script.
Bonnie & Clyde - this underwhelmed me when I saw it, although it's been a while.