Briant, you can't go wrong with any of those choices. There will be no clear-cut "best" of that group and any of them will handily meet your needs.

I have the PB12-ISD. It is a monster. I wanted a down-firing sub rather than one that matched my Axioms. I liked the idea of the "plate" on the bottom since I have it set on carpet. I liked the idea of buying something that supports American manufacturing jobs.

I'd agree that, in that size room, you don't need to spend the extra money for an EP500-class sub.

bibere usque ad hilaritatem