If you want TRULY great horror, you need to READ H. P. Lovecraft. None of the stupid slash and gore crap for him. Real deep down pull the covers over your head and don't let your hand hang over the edge of the bed and you can't sleep because something nameless will get you if you do psychological horror that grabs you by the balls and squeezes.

Try THE CALL OF C'THULHU. Or read his short story THE COLOR OUT OF SPACE. Read it in my teens and it scared me ****less.

Robert W. Chamber's THE KING IN YELLOW is good, too.

The best horror movie I ever saw was IN THE MOUTH OF MADNESS starring Sam Neill

The original PHANTASM was pretty good, too.