The TKC is a better knife than either the Hiromoto AS or the Masamoto HC.....although with some time the AS becomes a darn fine knife. But, still, OOTB, the TKC is a hands down winner.
Can't say that I've ever seen the Togiharu for comment though.
I'm with you on the extra length in a nakiri....I MUCH prefer 180mm to 165mm and would recommend the Konosuke based on this criteria alone. Add to that it's an incredible knife and you have a winner.