After I got my first Japanese guyto knife some 15 years ago, I slowly built up a collection of various carbon steel, stainless steel; single bevel, double bevel; chefs knives, deba, and yanagiba. I've added more and more tools to sharpening these knives. But my workhorse stone has always been a cheapo 1000/3000 combination stone with rubber base. I'm ready to give the stone away to my sister and find myself something more "intermediate" level. I don't want to bother with chip repairs, and I don't have any interest in natural stones. I just want to sharpen and maintain what I have. I already have an Arashiyama #6000, and that's as fine as I'll take it. So I want something to fill out below it. Say a 1000 and 3000 grit stone I do live in a tiny apartment in Manhattan, my entire home is the size of some people's kitchens, so space is a consideration. I don't have room to permanently soak, or storing fancy mounting rigs. I have an Atoma 400 to flatten stones, not to use on knives. What would you recommend?