Don't believe the hype!
I would love to see you step up to slightly larger subs. I know I mentioned the PC4000s before!
But you do not need a single large sub. You will benefit much more from getting multiple subs into your space. 2 PC2000 Pros should capably handle your room, especially with good bass capable speakers.
That being said, I would still set your speakers to small and start experimenting with the XO at 80Hz.
When you realize the second sub in your home, hopefully you will have no more doubts. If you are able to do this within a year, and find you are completely unhappy, you can upgrade through SVS. (Its part of the price you pay to join the SVS club!
)
Anyway, those PB16 Ultras are absolute monsters. You were worried about space before! Just one of those will eat up a huge chunk'o'space. You'll need to sell half that Sofa.
(Frankly, that might not be a bad thing unless you have a family of 12 you need to seat for movie night!
)
But seriously, folks...
Pretty certain I recall everyone supporting your choice to aim for 2 PC2000 in baby steps. The new speakers are going to put it all over the top. Just stay the course, I say, and get that second Sub as soon as you can.