Thank you very much for the input!
A good sub will match with any speaker. That doesn't even need to be questioned.
Yeah my guess was that it would match fine with the Mini-Monitors given that subs don't need to be timbre matched like the rest of the speakers. I just mostly wanted to make sure that the two were of roughly equivalent SQ. I had looked at a BIC PL-200 when I was looking at buying new, but I just felt like it really wouldn't have the musicality to pair with the Mini-monitors for critical music listening.
The PB-12 would have more than enough output to fill that space, and yes, even the previous PB-10 would have as well, however you can't consider the "listening area" you have to consider the entire space that is open to where the sub is; aka the entire basement if it is one open room.
As far as output is concerned, the room does have one small entrance to the rest of the basement and I recognize that this will make it difficult/potentially impossible to truly pressurize the entire space at this price point. Corner loading or near field placement would both be potential options to maximize output and produce still produce some of the tactile sensations.
I have a sealed Rythmik F15HP and love it, but unfortunately even their lower end subs are at a whole different price point than I'm looking at and there aren't many out there on the used market. I also have been looking at used HSU and Outlaw models, but haven't been able to find anything in my limited price range so far.
-Ryan