Horror is my passion in life. But I will admit like many here there are large chunks missing from my education. (I'm going to highlight all the must-see films below in red.)
I've only seen 1 silent, 2 Hammer films, maybe a couple Amicus's, and except for most of the main Universal 30's films (and even then I need to re-watch Frankenstein and I've never seen Creature from the Black Lagoon) but the trouble is is they made so many sequels and smaller spin-off films with Karloff and Lugosi (etc). Thanks to MGM though, I've seen almost all of Roger Corman's AIP (American International Pictures) films but until Polanski started his NYC trilogy with Repulsion, I've only seen the odd cult film (Carnival of Souls, Spider Baby, half of Dementia 13) and all the Bette Davis movies she did when she was a horror hag in the 60's (The Nanny, Dead Ringer, Hush Hush Sweet Charlotte, and of course the movie that started it all What Ever Happened to Baby Jane?). Oh, and I've seen a few William Castle movies. All of which I highly recommend (House on Haunted Hill, 13 Ghosts, Strait-Jacket, The Tingler).
Since I got Netflix, I started working my way through Mario Bava and until Hatchet for the Honeymoon, I didn't like any of his earlier films (Black Sunday, The Girl Who Knew Too Much, Black Sabbath, Kill Baby Kill). At all. I still need to see Blood and Black Lace and Whip and the Body but I'm not expecting either to change my mind. If I can call Corman gothic (Masque of the Red Death, Tales of Terror, The Raven, House of Usher, Pit and the Pendulum, Tower of London), I seriously prefer him over Bava. Until we get to Hatchet for the Honeymoon. Between then and Lisa and the Devil, all his films have clicked with me (5 Dolls for an August Moon, Baron Blood, and Twitch of the Death Nerve / Bay of Blood).
Once we get to the 70's, that's where I decided I needed to see every single highly acclaimed horror film ever made. Though I'm still missing a few: The Wicker Man, Possession (1981), Lair of the White Worm, Magic (1978), Two Evil Eyes, The Town That Dreaded Sundown, almost every Asian horror film between Kwaidan and Bio Zombie (A Chinese Ghost Story, The Bride with White Hair, The Untold Story, Evil Dead Trap, Ringu, Junk), all of Guillermo Del Toro's films, and for some reason I've made it a mission to see Lucio Fulci's The Psychic. Don't know why. I won't even think of bothering with anything he did after Manhattan Baby (which is awful but I have a bit of a soft spot for). And I've had Bloody Birthday kicking around in my Instant queue for almost a year and I want to kick myself for not having watched yet.
Anyway, my Top 13 Horror Films (all are must-sees in my opinion- none are remakes which I hate with a passion except for The Fly, Cat People, and I have no beef with Carpenter's The Thing or that new Maniac movie... or April Fools Day, Night of the Demons, or Sorority Row but I never saw those remakes):
13. Killer Klowns from Outer Space
12. Creepshow
11. Deep Red (1975)
10. Dawn of the Dead
9. The Last House on the Left
8. Dead Alive / Braindead
7. Halloween
6. The Evil Dead
5. Suspiria
4. Deathdream
3. Carrie
2. The Texas Chainsaw Massacre
1. Rosemary's Baby