Try EZE-Lap, they have a nice brass handled one that alot of people seem pleased with,(I am with mine). Also DMT (www.dmtsharp.com )makes several from pocketable to butcher steel sized, again very good. Also have a "Jewel Stick" 3 sided butchers type "steel" Which has coarse, fine, and ultra fine that works very well on my larger blades. All I believe are monocrystaline formation, not polycrystaline, which is more durable and less likely to wear out as the diamonds do not fragment from the surface while sharpening. Prices for good diamond sharpeners can range from around $10 to nearly $100 or more depending on size... etc, but mine have lasted for years. I even used two DMT diafold type sharpeners in industry sharpening shearing dies several times a week and they are still flat and sharpen knives well.