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I say if you're going to start to maintain, use the 12k Naniwa or 16k shapton glass, then buy the norton combo 4/8. If you are careful with your edge, you can get away with the finisher. No dings,...

If you are looking for the most economical way to keep an edge, then IMHO you should go with paste and strop like CrOx. However, eventually, you would need a stone.
I have gotten consistent on...