That's a good list. I had not even heard of New Terminal Hotel. That's a great story.
Snuff/Slaughter is barely worth the effort to track down and see. Slaughter is just plain terrible, and the added bit for Snuff is pretty appallingly fake. Still for sheer novelty it is memorable.
Cannibal Holocaust is hard viewing. The mondo especially is hard for me to watch. Lizard In A Woman's Skin is more notable (to me) for being a giallo directed by Lucio Fulci, who normally did more supernatural horrors. I remember the story about Sheen see the Guinea Pig movie at a Hollywood party and being convinced it was an actual snuff film. I don't know what substances he was "winning" with when he saw it, though.