After using the stones for a while I would say for any future readers of this thread avoid the Naniwa Combination Stone 1000 / 3000 , the stone is too hard and doest cut well, it barely creates any mud, seems to be a bad quality.
I'm quite happy with the King 1000/6000 (I got the small size 150 x 50 x 25 mm) but I did try another alternative of a bigger size which is the Suehiro new cerax 1000 / 3000 (#3000 - 186mm x 63mm x 13mm, #1000 - 186mm x 63mm x 15mm) , it has a silky quality but cuts fast and is not as soft as the king, I think it a great value and I prefer it over the king stone.
Now I'm thinking of a coarse stone and I'm between two options,
The price is almost identical but the 320 offers more stone for the money (205 x 73 x 23mm for the #320 vs 183mm x 63mm x 20mm for the #400), on the other hand the #400 has a nice base.
Anyway does anyone have experience with any of there of would recommend one or the other?
Also do you consider the #320 grit too coarse compared to the 400 of they are similar? (they will be followed by a #1000 stone).
This coarse stone will be used with my older non Japanese knives (even pocket knives) that need some thinning and re-profiling since my new Japanese knives are is quite perfect condition and will be a few years probably before I need any coarse stone work on them (if any).
Also I'm thinking of buying a Suehiro 'Rika' #5000 finishing stone (206 x 73 x 23mm).
Currently I use the 6000 king so do you consider the Rika a better stone or the only benefit for me would be the bigger size of the stone?