Here is what I am buying for everyone (6) in my family:
It is the 2-sided diamond plate ($14) and the Viking Whetstone from Ragweed Forge. The diamond plate works great on 154CM so it should work on S30V. The Viking Whetstone is something that looked pretty, but useless. I had been looking at them for a long time and finally had an order to justify getting one ($10). They work great for getting that smoothed and polished edge on your knife. I was really surprised how well it works. I am going to get everyone in the family one. They are about 3" long.