I left out finishing on a couple more naturals, Welsh Slate and a Blue Escher. Right now I can get a pretty comfortable shave off of any of the progressions I am using. My favorite finishing stone is the Escher.
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+1 on what Bob said. Back when the zulu was the latest thing, the consensus seemed to be that it was pretty much the equivalent of the 12K Nani but smoother or more "buttery". Mine now has an almost mirror finish to it and seems to be effectively finer. BTW, I'd suggest that you shave a couple of times off the zulu without using the 0.5 spray (after normal stropping, of course) else you may lose the smoothness that the stone delivers. Then try it with the spray and compare.
rs,
Tack
I'm jumping from 8k norton to coti now, and get to mix in ZG when he gets here...i skipped the 12k, but whadda i know?