For me it is Higurashi No Nakukoro Ni/When They Cry:
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High School of the Dead for me0
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Jigoku Shojuo (Hell Girl)! :D
And School Days! It's like a slice of life meets horror. Not spooky or gory, but these people make such horrible decisions it actually turns scary.
Ghost Hound was a good SoL/psych thriller. Very cerebral.
Then there's the old go-to's like death note, devil man (the 90s movie, there's an old ass, unrelated series by the same name), and high school of the dead.
All every good choices!0