I use and really like the Spyderco Triangle sharpener. This is the only system I have ever used that I can get knives TRUELY shaving sharp. I mean hair popping sharp. I have used other systems, and this one works best for me. I use it for my Magnus Stingers as well. A few strokes after practice, and the heads are good to go. Plus, you can do hooks, serrated blades, etc.
http://www.spyderco.com/catalog/details.php?product=77
jmac