morbid brings up a good point any thing with vincent price is hardcore

Gojira and Beast From 20,000 Fathoms are also must sees.

return of the vampier with bela lugiose its way better tgen dracule and a must see

these have probably been said already but ill chime in with my 2 cents.

House on HAUNTED Hill
Carnival of Souls
LAST Man on Earth
Attack of the Giant Leeches - good stuff

If you liked The Haunting, I'd strongly recommend The Innocents (1961) and The Uninvited (1944)

Heebie I was the same way. I find that pretty much anything with Vincent Price (well, with the exception of the Dr. Phibes movies) is a guaranteed kick. Sometimes watching the originals to which you've seen the remake can be good to grab you while the style gets under your skin. Good ones are House on Haunted Hill and House of Wax.

If you are also a reader, the book tie-in for The House of Usher, the Hound of the Baskervilles, The Masque of the Red Death, and way too many others to list had this great man.

Prepare to be disappointed. KWAIDAN is the kind of move likely to turn you off classical horror - beautifully shot, but long-winded and tedious. It's not necessarily bad, but it is an aquired taste. Not something I would recommend to someone who is trying to sample some titles to whet his interest.

Haven't read it here yet and maybe it is considered sci-fi but still

IT, the terror from beyond space
There's just something irresistable about a monstermovie with IT as the title.
From hell it came is another great title but the movie itself, although I liked it a lot, is for fans only.
The classic THEM is also very good!

Classic horror is often an acquired taste though and the only option is watching them and not giving up to easily, you never know wich one you're going to like. But once you get a taste for it there's a lot to be discovered.

Classics for a newbie
 

I would choose these.

The Night Of The Demon
The Incredible Shrinking Man
Dracula's Daughter
I walked With A Zombie
The Bride Of Frankenstein

and one of the scariest ever The Exorcist!

All of the classic Universal Studio films:

Dracula (1931)
Dracula's Daughter
Son Of Dracula

Frankenstein
Bride Of Frankenstein
Son Of Frankenstein

Creature From The Black Lagoon
The Wolf Man

The Mummy (1932)