I made a drive up to the Hsu facility in Anaheim last Friday and, after a demo of their different subwoofers and based on their recommendation, made the decision to purchase the VTF3 mk5. My room is smaller than yours, at about 3,000 cu ft, but has a large opening into our stairwell and the entrance to our home. So, it's still a lot of space to pressurize and my options for placing the sub were somewhat limited due to WAF.
The VTF3 does an outstanding job and I am very pleased with my purchase. I looked at and demo'd the PB2000 as well. It's a great subwoofer, but I think the VTF3 is more capable. I am about 50/50 on music and home theater and am very happy with the performance for both applications. The Hsu sub certainly digs deeper than my previous Martin Logan and provides a very visceral experience in my room.
By the way, it is big; but I found it's nicely made and finished and blended into our room well in spite of its size. I was able to haul it upstairs myself and move it around, but it is a handful. Good luck with your purchase. I am sure you'll enjoy it.
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