Give any of the Japanese style waterstones a try, you will love them. The Norton 4000/8000 is a premier choice at a reasonable price. The Japanese concept stone will be water soluble. As you use the stone the abrasives will slowly exfoliate off into a pasty slurry. As the slurry particles roll around under your blade they cut very finely but quickly You will get terrific edges in far less time with far less effort.