I still haven't got around to 'Breakfast at Tiffany's" but everyone seems to like that Hepburn film, i haven't seen much of her stuff.
I would say that you should watch "Wait until dark" though with her in, a film i really like with her as a blind woman being menaced by a couple of villains in her apartment.
Talking of apartments, have you seen "The Apartment"?, that's a really good 60's comedy with Jack Lemon and Shirley MacLaine in.
And talking of Jack Lemon, him and Tony Curtis are really good in "Some like it hot" with Monroe, i can vouch for this as i really liked it.
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MIKE: I've got it! Peter Cushing! We've got to drive a stake through his heart!
VYVYAN: Great! I'll get the car!
NEIL: I'll get a cushion.