To be honest, I wouldn't go with the kitayama for this blade, especially if you're jumping from the 1200 stone. I do have a kitayama myself and whilst it has a place in some lineups I think it would be too quirky and maybe too fine a stone for this series of knives. A 6kish stone would be doable and there are really soooo many stones you could use but everyone has different preferences. I like harder stones that are also pretty tough and dont care about permasoaking and whatever such as the bester or sigma power (probably shapton pro as well) series for bevel setting. Dishing isnt a big problem within these lines. I don't care as much for soft stones as they are messier and can tend to wear unevenly very easily, which can occur if youre dealing with fairly out of shape knives. Finishing stones im less picky with but again I feel like harder stones have less maintenence required. That said, I do like the feeling of the suehiro rika 5k stone and the price is pretty good. That said, there are several high quality stones you could use. Having an actual budget would probably help give you more definite answers so that you will feel like you're getting high quality equipment for the price you are paying