Any good 80's to early 2000's horror or thriller animes?

I've been looking to get back into anime, after not watching for a while. I've watched some gems recently like Shiki, Hellsing, etc etc. But I'd like some anime recommendations from people who avidly watch anime on a regular basis, the real anime vets! ヾ(`ヘ´)ﾉﾞ