I wouldn't get too involved with buying many stones. You can do the whole thing with just two - a very coarse and a fine. In my case it's a 100G hand crank followed by a 1200 Eze-lap diamond. I then strop on leather. Sharp enough for my needs. Simple, quick and unfussy. The diamond plate is 6 x 2", wide enough for any plane blade providing it's skewed when sharpening. I can tell the quality difference between the Eze-lap and the Trend. At £25 the Eze-lap wasn't hugely expensive. In coarser grits and bigger sizes they are significantly more expensive.