THE SHAWSHANK REDEMPTION by Frank Darabont, a study in perfection of writing, adapting the long winded Stephen King into an economy of words that was actually better than the source material.
BACK TO THE FUTURE by Bob Gale and Robert Zemeckis, a study in minutiae that matters. A script about near-incest and yet made it family friendly.
NATURAL BORN KILLERS, the Quentin Tarantino draft only! the original is a work of art that will never be made. If you can put your mindset into RESERVIOR DOGS and PULP FICTION, then read Quentin's draft, you'll get a great idea what a masterpiece this movie could have been, but wasn't.
MEMENTO by Christopher and Jonathan Nolan, a very inventive and well written script, with all the editorial choices made in the script stage.
TEQUILA SUNRISE by Robert Towne, one of the most underrated movies with some of the best quotes I've ever read from characters.