My list has changed as I've seen a few more.
Demons (Amazing atmosphere & soundtrack this movie has, I wish Tony the Pimp was in it longer)
Inferno (Pretty powerful film, don't know why I didn't like it the first time)
Burial Ground (I usually don't like zombie movies but thought this was stunning)
The Black Cat (I love the cat, great soundtrack and very realistic cat attacks)
Black Sabbath
Suspiria
City of the Living Dead
Conquest
Massacre in Dinosaur Valley (The cannibal movie I watch the most, even though it isn't really one)
Delirium: Photo of Gioia
Delirio caldo
Deep Red
Bird With Crystal Plumage
Suspiria
Opera
Don't Torture a Duckling