I'm a big fan of the MR James Adaptations that the BBC did at Christmas for many years:
A Ghost Story for Christmas
More Exploitation than Horror but I love MY SWEET SATAN:
Some of the Stephen King Dollar Babies aren't bad.
Some Others:
The Lottery (1969)
Treevenge (2008)
Rare Exports Inc
Return to Glennascaul
In the Wood (the Rami film)
Also The Saw short film is good too.
Here's a LINK to see some of the films I mentioned ONLINE!!!