You already have a set of naguras that might be good.I found a very useful link on the Mikawa Asano Nagura.
Mikawa Nagura with Asano Evaluation - Natural Whetstones
Information about Mikawa Asano Nagura Japanese Natural Stones Origins, Layers, Progression, Koma vs Mejiro, Purchasing Locations and Stamps.naturalwhetstones.com
For the price these stones are selling for you can get a good mid-range fast stone, like a suita.
There is something special about using these naguras in a full progression. However, i don't think that the result are any better then if you used a mid-range stone instead.
I would need to test these stones in person, using my own base stones to be able to put together a good set of naguras. I am not in a position to do this. I usually pick one that works the best with the base stone i use.
My Koma seems to be more versatile. This is soft, and will release particles quite easy on most stones.
I also think that getting a set of stones that range from coarse to fine can be difficult. I can jump to a tomo slurry from any of my Mikawa naguras. The only one i have that is truly spesial is the Koma nagura.
Do i need koma seems to be a common question. If i was buying nagura stones now i would put my budged into a good Koma.
A good shiro suita nagura can also be a good option.
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