Originally Posted by neo_ny
Any thoughts will be appreciated, thanks in advance for your help!
As you posted, you're asking to much out of too little. With that in mind, the short answer is, the XV15, placed directly behind or to the side of the main listening position and if your main listening position is located in a corner, corner placing the subwoofer, next to the main listening position, would be even better.
Is it worth paying two hundred dollars more? Absolutely because a fifteen inch subwoofer has approximately twice the output capability of a twelve inch subwoofer and in a room that size, using a single subwoofer system, output is everything.
As to which subwoofer looks the best, are you going give it a hug or listen to it's output. If you want both, like everything else in the world, looks and brains are going cost you.
Which are the best looking subs out there that also perform well and don't break the bank? Or is that asking for too much?
Yes, you're asking too much. Again, looks and brains are going cost you and based on everything you've posted, (for a three room total of ~7,600 cu ft), you should be looking at a set of four, or more, XV30's. Personally, you should be looking at 18" drivers.
Naturally, people have a normal visceral response, wanting a $10k subwoofer system, bottled in a $0.75k (or less) subwoofer system. Unfortunately, as they explore the issue, they disappointingly find out, it ain't gonna happen.
"Great expectations, major disappointments"
You best economic choice, a flat pack that you assemble and finish yourself which use 18" drivers. If you can find a dual 18" driver enclosure, economically, that will be your best choice. Expect to hide the subwoofer as I'm quite sure it's not going pass wife approval. If you want a retail product that will meet with your wife's approval, my expectation, you're going have to spend upwards of $2.5k for a single subwoofer that meets your specifications.
In a single subwoofer solution, the below image is what you're looking for
and for $2,300.00, you can own one and your wife will be putty in your hands. Well, that's my version. Anything less in output and you're setting yourself up for sonic disappointment.
Less expensive, not as pretty and not as much output, the PSA, XV30f.
Two of them would be ~$2,700.00.
Yes, I understand my recommendations blow up your budget. Yes, I understand my recommendations have up to zero WAF. My point is to show what you "NEED" for your room vs what you are wanting to put in your room vs natural and reasonable expectations and expected disappointment that will inevitably follow should you buy "ANY" of your single subwoofer choices.
I hope the above helps with your journey.