What is the best way to sharpen a W�sthof Clic 20cm chef's knife?

I just purchases a W�sthof Clic 2-Piece Knife Starter Set and am wondering what is the best way to maintain that sharp, factory edge? I don't want to spend a ridiculous amount of money on a diamond impregnated sharpener, but I want a simple, effective way to keep the edge like it came from the factory. Please answer from experience only; I'm only interested it what actually works, not what an advertisement says will work. Thanks in advance for imparting your wisdom.