I bought a set of wheels for my bench grinder. One has the grit on it to do the initial sharpening and the other to polish the blade to like razor sharpness. I bought them at a gun show for around $25.00. I use a hone to touch up the edges when needed.
My Gerber LMF II has a carbide sharpener built into the sheath. I wouldn't use a carbide sharpener on anything but that blade, they take too much material off.
Norton tri-stone set, plus a diamond & smooth steel on my work knives. When customers comment on how sharp my knives are I use to tell them "Just like OJ's. "
My hunting knife has a straight edge, so I just use an oil stone and a leather strop. The trick is don't let it get too dull or you'll be at it for an hour doing it this way.
I have many knives i use in my saddle shop and i use a oil stone and a leather strop with jewlers rouge my knives are used daily and sharpened daily and will cut anything with little to no pressure sharpening this way takes practice but is good to know.
I must admit I have purchased every sharpening stone, stick, or steel ever made I think. Sucker for a better mousetrap. I usually use a steel for the edge and the Case Moonstone (ceramic) to polish it. I don't let them get too dull and I don't try to oversharpen them.