Two more films I'd recommend.
"Crest of betrayal" (1994) may be not Fukasaku's best movie, but probably the most beautiful to watch. Surreal mix of samurai action and horror, full of dreamlike images and violent swordfights.
"Blind woman's curse" (1970) is a mix of samurai-horror again, but the director here, Teruo Ishii is no Fukasaku, so it is not masterpiece, of course. Still, it has some cool swordplay of its own and (!), it has Meiko Kaji. This lady is great, just for having a chance to watch her I'd recommend this film.
By the way, both titles come from www.ebay.com