PS 1000 is a great sub. I have a previous version and i have been always happy with it. I didnt like the cabinet redesign on the newer version though.
I have compared it to the SVS-10ISD sub. The SVS will go lower and louder than the paradigm and it costs only a little more. I did think the paradigm played better with music, but i watch more movies than listening to music.
If you can afford it, get the SVS.. if not the Paradigm will be good too, especially of you dont have a large size room.