Welcome to the forum,
I'm not sure which would fill your room best. I had a PB12-NSD in a 13x23x8 room and it really rocked, but with some openings to other areas I felt that I "needed" more headroom. I have no heard the PA-120, but they seem to get some good words especially for the price. But so does the SVS. Maybe someone here will be able to help who has heard both or knows the PA-120 well.
I'm not sure which would fill your room best. I had a PB12-NSD in a 13x23x8 room and it really rocked, but with some openings to other areas I felt that I "needed" more headroom. I have no heard the PA-120, but they seem to get some good words especially for the price. But so does the SVS. Maybe someone here will be able to help who has heard both or knows the PA-120 well.