The Shining
Friday The 13th 1-4
Halloween 1 & 2
A Nightmare On Elm Street
Texas Chainsaw Massacre 1 & 2
Jeepers Creepers
The Ring
The Grudge
Underworld
Final Destination 1 & 2
Urban Legend 1 & 2
Carrie 1 & 2
Lost Highway
Dark Water
Event Horizon
Galaxy Of Terror
Terror Train
Graduation Day
Amityville Horror (The Original, the remake SUCKED!)
What Lies Beneath
Phantasm
Day Of The Dead (Original)
Killer Klowns From Outer Space
😉
The Thing is a very good choice! Also very entertaining: Hellraiser 1&2, Dog Soldiers, Alien & Aliens, Silence of the lambs (not really horror, but still very gruesome), Romero's 'of the dead' movies, The Exorcist, Evil Dead 2.
And if you want some laughs in between the gore, try Braindead and Shaun of the Dead