Thanks for all the ideas. Have not checked all of them yet.

Some observations:
ULS-15 looks nice but it is overkill. \:\)
The cheaper HSU’s don’t go higher than 90Hz or so it looks like, I could be wrong.
I need something to be able to handle 100Hz well that’s where I would crossover.

So, it looks like SVS could be a good choice.
While the new version of PB-12 looks cool it is too expensive.
I don’t like the idea of down firing subs and cylinders.

Thus:
Either PB12-Plus or PB12-NSD not sure which one is better.
PB10-NSD doesn’t seem to have very many controls.
Still no idea, lots to look at.