So, what's everyone's favorite. The Kikkoman/Yamasa/etc., are kinda
generic (but readily available here.)

My favorite, available only in Japan, is Kikkomaruki, brewed out of 
Sukumo, Kochi-ken. We first had it on a trip to Otsuki, and the
wife picks up 3-4 bottles on each yearly trip to Japan.

Any others?

Mike