Welcome Mad!
Just one quick thought about sub selection is that an Axiom sub can match the finish on the rest of the system, improving the WAF.

I haven't compared them, but anecdotally, many say that there is a "texture" to the Axiom subs that is missing with other subs, making them better for music.
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::::::: No disrespect to Axiom, but my favorite woofer is my yellow lab :::::::