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In my opinion those are more than enough for knives, a lot of people here are finishing their razors on the UF, and are liking the results.

Which spyderco stones do you have? The brown one in my opinion is about as fine as a 3k Naniwa, the fine and ultra fine are much finer than the 1/3k Naniwa.

Naniwas are nice for knives too, but they load up fast, and you can gouge them with bad technique and too much pressure. If you like your spydercos, than maybe you won't like the nanis for knives.