I'd go with the Howling Rat. The steel takes and keeps a very good edge, and is easy to sharpen. I've never had a problem with rust yet. The grohmans are a little too specialized, and I really dislike S30V. I'm not a fan of Moras, they are fine for cheap knives, but many of my knives outcut them and are much quicker to sharpen. But, at $10 each, they might be worth a look. YMMV.