well, as an ex-b&n employee i'm gonna go ahead and tell you that you can get most of them cheaper elsewhere even at half off.
that being said, if i had the money i'd get the following:
eraserhead
being there
ghost world
rebecca
pan's labyrinth
drunken angel
sid and nancy
the devil's backbone
seven samurai
the graduate
throne of blood
night on earth
shallow grave
the last days of disco
the hidden fortress
tie me up! tie me down!
mulholland drive
punch-drunk love