Hi I have a question about what grit water stone i should buy. I have just purchased a new-west knife-works "the 9" and i also bought the DS4 Diamond Steel. My question is since the diamond steel sharpens as opposed to honing do I need to only get a polishing water stone with a high number grit? also how often do you use a diamond steel compared to a honing steel, will i still need to use a honing steel at all? Thanks!