Thread: if you had to keep it down to... 3...

I have a DMT 1200 6"X2". Costs 18$ + shipping
I have many coticules, but one would suffice. A 6"X2" costs 78$ + shipping

I have coarser DMT's , a couple of Belgian Blue Whetstones, but for honing razors and mild restoration, I can get by with the two above.

On the rare occasion the coticule needs flattening, the DMT can get the job done. The DMT doesn't need lapping. Neither of them needs to be soaked in water prior to honing (just sprinkle on some water and you're good to go) They don't glaze. All things I like.

You would get a lifetime of very smooth edges for a good price.
I don't have a Norton and I never used one, so I can't compare.

Bart.