In Order:

1/  VIRIDIANA
2/  UN CHIEN ANDALOU
3/  NAZARIN
4/  THE EXTERMINATING ANGEL
5/  L'AGE D'OR
6/  SIMON OF THE DESERT
7/  TRISTANA
8/  BELLE DU JOUR
9/  THE YOUNG ONE
10/  THE DISCREET CHARM OF THE BOURGEOISIE

most underrated:  THE GREAT MADCAP and WUTHERING HEIGHTS