I am in the process of setting up an HT in a mid-size room approx. 15x17. Speakers are all Paradigm, Monitor 7 front, Monitor 3 rear, CC-170. Looking for a decent powered subwoofer to go with this set-up. This equipment/room is strictly for movies. My 2 channel music system is in another room. So, the sub would just be to enhance the sound effects of movies. How are the Paradigm subs? PDR-10,PDR-12,PS-1200? I have also read about the HSU subs. I'm trying to keep the price around $500. Any suggestions would be appriciated. Thanks.