A-gon'r Kr4 has compared many of the available room correction devices (not sure about the SVS) in his work for Stereophile. You might want to drop him an e-mail.
I did. Unfortunately, he's in the process of reviewing the SVS/Audyssey right now, so he couldn't comment.
I think it's boiling down to this. Two identical subs from either SVS or Hsu, and see how well I can work things manually. The PEQ can be added later in several different ways. Leaving some budget for such future devices, I'm probably looking at a choice between 2 SVS PC12-NSD ($569 each) and 2 Hsu VTF-2 ($549 or $649 each depending on finish). I lean to the cylinder concept for subs, but I know my wife would prefer boxes. Hmmmm...
Thanks again,
Lou