My suggestion? Shell out $15 or so and pick up this set:
http://www.amazon.com/Horror-Classic.../dp/B0001HAGTM
If you're looking for a cash course in B-grade horror flicks, this is ideal. Sure, there's a lot of crap...but if you're looking for classic horror/suspense from the 40's through late 50's (plus a few earlier/later flicks), this is the perfect place.
Some of the highlights:
- The Amazing Mr. X
- The Killer Shrews
- The Brain that Wouldn't Die
- Nightmare Castle
- The Screaming Skull
- Tormented
- Creature from the Haunted Sea
- Little Shop of Horrors
- Dead Men Walk
- The Indestructible Man
It's got it's share of honest-to-God classics, too: Last Man on Earth, Night of the Living Dead, Nosferatu, Metropolis...but the majority are just sweet, sweet old school cheese. HIGHLY recommended.