These are in no particular order.
Night Of The Living Dead
Dawn Of The Dead
The Evil Dead
The Creature From The Black Lagoon
Count Yorga Vampire
An American Werewolf In London
Let's Scare Jessica To Death
These are the films that really made me love the genre. I really miss the glory days of late night horror shows, mom and pop video stores, and theaters being loaded with stuff that would more than likely go direct to video today.