Bruce,
I'd seriously consider the CSMIO/IP-S. It's the one I'll be using if I ever get around to assembling my machine.
I've heard nothing but outstanding reviews from the most respected members of several forums.
As Jazz says, it's the best available. It's expensive, but you won't need the PMDX-126, so the total cost isn;t that much more than the PMDX + ESS.