Well, I'd recommend Mononoke. I think it's a great piece of suspense and psychological devices to create horror. Besides that it has a reinterpretation of the traditional meaning of certain yokais, beautiful animation (quite well done) and unique style! (and ah, the topics it touched...one can dig on them so much!)
This trailer is also perfect:
[video=youtube;5OJW9gZL33Q]http://www.youtube.com/watch?v=5OJW9gZL33Q[/video]
Tbh Mononoke is one of my fav animes...but it's not very popular because it is...uh...too japanese. Some ppl don't get it and have eh...wrong ideas about it. Like a certain one person who believes the emphasis of the anime is to present young innocent and selfless good women.. wth? From where anyone would get such idea?
At any rate, I made some comments about the visual style (which seems to be hated as well...ah, and I think it's beautiful!) in this thread:
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