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Actually get the Norton 4/8k anyways. You'll need it in any case but read some of the older threads about fine finishing hones.

If I were you, I'd hold off on that until you hear from someone who knows more about this than I do.

It should be OK for a lifetime of use if you're just using it for your own shaves. Especially if you also get another stone for touchups. I'm getting a coticule, but there are other finishing/touchup...