I highly suggest getting the Lansky sharpening system. I could not sharpen a knife but boy can I dull one. With this system, I can sharpen a knife so sharp the hair literally falls of your arm when you shave it with your knife. It's not a fast system to get that edge, but once you get the edge on both sides of the knife just right, when you touch it up it only takes a few minutes and it's back to great shape again.
http://lansky.com/index.php/products/dlx-5-stone-system/
If I had not purchased the Lansky and had found this one before I made the purchase, I likely would have gone with this one. Both are great though.
http://www.kmesharp.com/kmeknshsy.html
It sure is nice to have sharp knives in the house! Kitchen, pocket, and hunting, and everyone is super sharp!!