John, thanks. I plan on duals - one for each channel. I use the pre-outs from my Pioneer to drive each of my current $100, sloppy-sounding subs.
The entire line of ported subs was re-worked by Andrew. I have never heard one but I've been around long enough to know the legacy designs left a lot to be desired. The new ones reach lower, suffer less distortion, have more power and are more reliable. I think they are finally what they ought to have been from the start.
I need subs that are musical, integrate well with the M2OW, have the finish I want and are small enough for my living room. I'm leaning with giving dual 125s a spin. I suspect they'll sound as musical as the sealed subs but with less reach and output.