Insatiable is the best of it's era IMO!
The best movie of the 70's for me though is The Last Detail, with Jack Nicholson.
I've watched Monty Python & The Holy Grail at least 50 times and always find a funny bit that I've missed before

Used to use that movie to check out girlfriends, if they didn't think it was funny I knew they wouldn't last.
One from the early '80's that I really like is "Salvador" with James Woods and Jack Belushi.
"Willie Wonka and the Chocolate Factory" is a good kids movie for kids on acid as well.
The ultimate B or C movie for me is "Kutthroat Kommandos" though, very hard to find and seriously fucked up
