I generally like the Gangster genre from any country (specific list: Gangster Cinema) but Yakuza eiga is taking the majority of my attention. Especially the famed 'Yakuza eiga era'
1) Watch every available Yakuza eiga DIRECTED by: Fukasaku Kinji, Gosha Hideo, Kato Tai, Suzuki Seijun, Shigehiro Ozawa, Yamashita Kosaku, Moshizuki Rokuro, Masahiro Makino and Norifumi Suzuki.
2) Watch every available yakuza eiga with Takakura Ken, Sugawara Bunta, Nakadai Tatsuya, Shishido joe, Watari Tetsuya, Kobayashi Akira and Kitano Takeshi.
Few of my favourite films:
Favourite Yakuza Stars: Full List
Upcoming Yakuza anticipation: Yakuza Apocalypse.
Also known as the brilliant Takashi Miike's Madness!