What NVMe is best for a fusion pool?

I've been thinking about how to set up a fusion pool, as I've discussed in my last thread where I asked about PCIe adapters. My conclusion there was to wait, but I'm now reconsidering because if I'll want to do it anyway later, I'll get better results if I bite the bullet now than if I add it when the metadata has already been written to the pool because ZFS won't move it all to my shiny new special vdev.

I definitely want to have the special vdev on a three-way mirror of NVMe's on a...

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