You have barely scratched the surface of the samurai genre!
Hideo Gosha directed a number of exceptional samurai films, starting with the fantastic "Three Outlaw Samurai" (available on import DVD), "Sword of the Beast" (available from Criterian as part of the Rebel Samurai box set), "Samurai Wolf" parts I and II (available from
www.samuraidvd.com), and the clasic "Goyokin" which was originally going to be the last Yojimbo film featuring toshiro Mifune (Media Blasters / Tokyo Shock), as well as a few others.
Masaki Kobayashi directed two samurai films which should not be missed, Even if you only watch two samurai films in your life. "Samurai Rebellion" and "Harakiri" (Seppuku) are both available through Criterian and star Toshiro Mifune in the first one and Tatsuya Nakadai in both.
Kihachi Okamoto directed a decent number of films worth watching, from "Samurai Assassin" (Toshiro Mifune), "The Sword of Doom" (Mifune and Nakadai, unfortunately, part one of a never finished trilogy), "Kill!" (Tatsuya Nakadai, one of my personal favorites, and while based on the same story as Akira Kurosawa and Toshiro Mifune's film "Sanjuro", it is a totally differant movie), "Red Lion" (Toshiro Mifune), and last but not least "Zatoichi Meets Yojimbo" (Shintaro Katsu and Mifune).
Hiroshi Inagaki is a director hard to ignore, what with the three part "Samurai" trilogy (starring Toshiro Mifune as Miyamoto Musashi) and "The Ambush" aka "Incident at Blood Pass" (featuring Katsu and Mifune). He also directed "Rise Against the Sword", "Whirlwind", "Chushingura: 47 Samurai", and "Daredevil in the Castle" (all featuring Toshiro Mifune and which are available through either official or unofficial sources on ebay, etc). His "Bandits on the Wind" is currently at the top of my "want to find" list.
Hopefully, this makes the scratch a little bit deeper into a film genre which, during it's "golden age", spanned three decades and saw literally hundreds of films released yearly during some of those years.
Also, check out the books:
"Stray Dogs & Lone Wolves: The Samurai Film Handbook" by Patrick Galloway - Stone Bridge Press, 2005
"The Samurai Film" by Alain Silver - Overlook Press, 2005
Abayo.....