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I'm with Gary and Karl on the 1,3,5, and 8. If you have the extra $ go for the 12 too. If the $ are tight some chrom ox and make a balsa strop and get the 12K when you have the extra $$.

I use the 1 to set the bevel if necessary and the 3 and 5 for sharpening. IME the 8 is enough for polishing but of course you can go beyond that with a 10 or 12 and I often do. Just IMO.