I personally like the
Misono UX10 line of knives. Light, well-balanced & sharp enough to converse at a mabo-fest.
A good place for knives in Kappabashi is the
Union Commerce store. (This is an english link because the store website is nihongo only). Service in the store is bi-lingual & the owner is a gem. FWIW, he may try to steer you into their own line of knives (sharp, but too heavy for my tastes).
See also:
Union Commerce.