The Aliens Prequel film got me thinking - with all the big-budget 'Blockbuster' films around (Day After Tomorrow, 2012, Smurfs in Space etc) where the directors seem to think more is, well, more - what properly low budget films captivated you because the story and plot sold it to you, rather than the big budget effects? Blair Witch? Shallow Grave (getting higher budget there I guess).
For me it was 'Cube'.

