VikingFan,

I have the 10 & 12 k Naniwas, and they both have given excellents results for me.

I tend to use the 12 k the most (in a 3-8-12 sequence, or alone for touch-ups)

THese days I use the 10 k for touch ups if a little more 'oomph' is needed.

Either of the stones will give you excellent results

Good luck !

Have fun !

Best regards

Russ