I have been using a 400-1000-3000 Chosera sequence, and I'd like to get a natural stone for two purposes: (1) finishing White and Blue steel Japanese kitchen knives, and (2) polishing the knife after thinning (removing the scratches left from the Chosera 3000.) The first is more important than the second, but will one stone do both of these well? Is there an economically-priced stone that would do this? (i.e. not $500+! Frankly, I'd love something in the sub $300 range.) Thanks so much!