dar - I'm totally with you on Ghostbusters.
Movies I have on DVD and watch over and over and over:
Amelie (always puts me in a good mood)
Willy Wonka... (one of my childhood favorites)
LOTR trilogy (very entertaining)
The Jerk (hilarious "I just heard a song that reminded me of the way we were")
Moulin Rouge (mushy romance and great music)
Shawshank Redemption (great story - happy ending)
The Goonies (super fun and quotable)
etc.
and the movie I could quote 99% of... Pee Wee's Big Adventure
"Look out Mr. Potato-Head!"