I am looking for a compact knife for slicing plug and rope pipe tobaccos. I have been carrying a SAK of some sort since I was a kid, but the main Blade isn't as sharp as I need for this and it doesn't lock. I was looking at the small Kershaws and the Ontario Rat/Rat II as that's around the price range I would prefer for a utility knife, but I really don't know anything about knives. Looking for something compact in the 3-3.5" Blade range, super sharp and retains sharpness well. Any help is appreciated.