I can just parrot the synthetic bandwagon - anything goes wrong in the Coti (frequently), the Nanis just deliver the goods day in and day out. Norton seems economical and reliable as it gets. The only fancy part I'd consider, depends on how many blades you need to set bevels on. If you do alot, that chosera 1k deserves all the praise it gets. I tried, and love it. If the most critical part of the honing is the bevel, having some horsepower here is money well spent. After that, most important being the finisher which is subjective voodoo. If you bevel is good and that allows your coti to perform well - no need to spend more. The rest, they say, is vanity.