The Strangeness
Alice Sweet Alice
The Changeling
Let's Scare Jessica to Death
Out of the list, I've (recently enough) seen those four.
The Strangeness is, if not a hidden gem, at least a hidden OK movie. It has really old-school stop motion stuff, too.
Alice Sweet Alice is a good Giallo-wannabe/slasher from the US.
The Changeling is a good (maybe even very good) ghost story (and I'm pretty sure I agree with the person who instructed to avoid the trailer).
Let's Scare Jessica to Death is also quite good (and people still think I hate everything).
I've also seen
The Stuff, but that was 30+ years ago, so no comments (my brother rewatched it a while back, though, and said it was OK). I also have
Lisa, Lisa waiting to be watched (supposed to be a bit sleazy, so maybe up to my alley). I also may have seen
The Deadly Spawn back in the day, but I'm not sure (I have a copy stashed somewhere, though).