Yeah besides the trilogy Camembert Electrique is mandatory. Maybe you shouldn't start with You - it's the last and best in the trilogy - however their silly side might be off putting, it was for me when I first listened to them but now I love it! You doesn't have too much of that silly pothead pixie stuff, and have some of the greatest psychedelic spacerock jams ever recorded, imo.
Third is such a great record where the murky production really levels it to new psychedelic heights - at least to me haha. One of the best prog records to smoke pot to, imo.
Herder - Soul Harvester