My faves are:
1. Beautiful Thing
2. Angels in America
3. Brokeback Mountian
4. It's My Party
5. Paris is Burning
6. Sordid Lives
7. Love! Valour! Compassion!
8. The Adventures of Priscilla, Queen of the Desert
9. Vegas in Space
10. Torch Song Trilogy
Not Gay but a classic is The Women ("Jungle Red")