Full disclosure, I have not first hand experience with these knives, but...some thoughts:
If you like the the Kohetsu, you might consider waiting for the HAP40 steel version. The HAP40 is a new semi-stainless steel that should perform well in a commercial setting. http://www.chefknivestogo.com/rihakn.html
For what it is worth, I would not be overly concerned about the newness of either the Kaneshinge or the Tanaka Ginsan to this site. The Kaneshinge is the parent company of Konosuke whose reputation is well established here. If you would prefer a more established line from the same manufacturer consider either the Konosuke HH (stainless), http://www.chefknivestogo.com/kogy24.html;
or the Honosuke HD (semi-stainless, http://www.chefknivestogo.com/kohdwa24.html
. The Tanaka on the other hand is a well established manufacturer using a well established steel, the newness of this particular product should not necessarily alarm. There is some discussion here including some pictures if you would like to read some thoughts on the knife, tanaka-ginsan-handles-t4422.html
Here are two offerings from Sakai Takayuki that should perform well: http://www.chefknivestogo.com/satadagy240.html
. The second one here does not include weight in the specs, but the Damascus offering is 6oz which is on the lighter, therefore thinner side. The Damascus is also AEB-L a really outstanding stainless performer.
Lastly two knives from the Richmond lineup may work for you. The Wa Artifex, http://www.chefknivestogo.com/todpwa24.html
, might be a budget contender. This appears to be a very different knife from the Western handled Artifex I own, but I have been happy with the Richmond knives I own from the Artifex lineup. This one is contracted with Fujiwara, who made another knife I own, with a strong reputation for its price point. The other would be the Laser, http://www.chefknivestogo.com/laser.html
, the Laser is in AEB-L, like the Takayuki above, but is lighter, likely thinner, and a bit more expensive.
I hope this gives you some ideas. For reviews or head to head comparisons, gotta ask someone else...