Erns
Here are changes to your above list:
Asagi: HOSOKAI, then Otsuka. I've heard Otsuka uses Hosokai bloodline for his breeding.
Showa - Torazo, Dainichi,Hiroi,Marudo,Sekiguchi, Seijuro,Yagengi
Aigoromo - Marusei
Yamabuki - Izumiya
Kujaku - Kaneko, Hosokai
Gin Rin Ochiba - Hiroi, Marusei
Doitsu Kigoi - Jurosuke, Hiroi, Hosokai
Toshio Sakai is located in Isawa, not Niigata. His brother Toshiyuke is there however at Yamamatsu Koi Farm. Many nice Gosanke and some Kawari.
When are going? This makes a difference as some breeders don't release their tosai for sale until March or later.
Mike