(accidentally posted before finished.) *blushes
All the usual suspects are always at play: Hsu, SVS, Outlaw, Monolith, Rythmik and PSA.
By all accounts, PSA is a solid company. My main complaint about them is that they do not send their gear out for any 3rd party testing, so you have to take what they give you, and the hearsay of their customers. Not a fan of that: I want to see the measurements if I'm gonna drop coin like that. Also, they use Pro Drivers which have a high Fs (resonant frequency), which requires much more power to reach deep than a driver with lower Fs would require. Deal breaker? Not necessarily, but this leads back to my first point: show me the measurements!
If you are seriously considering spending in that neighborhood, I would add in that you should shop
JTR. Arguably much better product, which has been measured, and they are known performers.
www.jtrspeakers.com
If I were to redo my purchase using only OEM products, I would probably look at 2
Monolith 15" subs instead of my
Outlaw X-13s.
My recommendation beyond all of this is to understand what is needed from Subs in your room, and how multiple Subs, properly set up in your room will always be better than one single Sub.
How big is your room? Total open room Volume, please: L x W x H. This is important.