I'm with David. For the price, a Norton SiC (coarse/fine combo) is an excellent value and good stone. Will cut almost any steel out there. And the Norton India (coarse/fine combo) is another excellent stone. The SiC (or Crystolon as it is called) stone will shed it's grit, which is good for exposing new sharp SiC grains, and cuts fast. But, over time it will dish and will need to be lapped flat. The India stone is aluminum oxide with a hard binder. It doesn't cut as fast as a Crytolon, but it doesn't dish as fast, either. It stays flat for a long time, and the fine side will refine an edge apex pretty well, with enough "bite" in it to help in slicing cuts. For the price, those two stones are an excellent option for a $50 budget. You might get addicted to sharpening, and then you'll want to upgrade your stone collection and nerd out like me! A full set of DMT DiaSharp 8" plates is expensive, but well worth the investment, and if used correctly will last the average person a lifetime. XC, C, F, and EF. They have an XXC and an UF, and even a MF (medium fine). If you wanted to cut it down to just 2, go with the XC and F.