Suspiria, Braindead, Cannibal Holocaust, The Beyond, New York Ripper, Opera, Phenomena, Evil Dead trilogy, Bad Taste, Maniac, Texas Chainsaw Massacre, All Night Long pt1,
I like those films too. I also adore Roger Corman's films, pretty much every Vincent Price film, Hammer, silent horror, John Carpenter, George Romero... all great stuff!
Horror is one of the best covered genres on DVD - it's been a real savior for fans!