Twitch, Vulcan, and Seal series are all winners. The AUS8 on the Twitch and Seal takes a good, shaving sharp edge that doesn't last long under hard use, but is pretty easy to put back on. The Vulcan series with VG10 blades hold a good edge, and its unassisted arc lock mechanism is awesome - up there with Benchmade. A Vulcan mini and the Twitch II are among my favorite EDC knives.