Scre4m - Probably my second favourite of the Scream movies after the original, but not something that I would have put on my list. I really enjoyed doing the LD's of the Scream movies though, they were among the best we ever did at Pulse.
People Under the Stairs - I was really close to putting this one on my list, it's pretty original for a horror film from that time period and just a solid little horror film.
Night of the Living Dead - Being the original film will always give it a bit of leeway, but I think Romero's work was definitely to come. I have no issues with this one being on the list mind you, I just feel it's a tad dated now. Still really like the ending though, good social commentary without shoving it down your throat.
Jeepers Creepers - Not a bad little horror, I even like the sequel with the kids on the bus. I didn't even think about it when putting my list together, but I've got no problem with it being on here at all.
From Dusk til Dawn - I really liked this movie until they got into the club. I wish they'd just expanded that into a feature-length story.
A Nightmare on Elm Street 4: Dream Master - One of my personal favourite horror movies, but not something I'd deem top 20 of all time material. I'll say this, Alice is a way better final girl than Nancy.
An American Werewolf in London - Surprised that only Wang and I picked this one, it's pretty much regarded as an all-time classic and has the best werewolf transformation scene ever put on film. Plus, how can you go wrong with Landis directing Griffin Dunne?
I'm hoping more of mine make it in now that we're getting into the nitty gritty of the list. EDIT: I saw that some others were posted, I'll chime in on those a little later.