Hello... I am also running the same parallel thread for subwoofer to hookup to my pioneer elite receiver. (
http://www.hifivision.com/speakers/54229-confused-about-subwoofers-one-more.html#post617923) Please check out if possible.
I did audition polk psw110 (which was good for music) and focal cub 3 (which was very good for movies) ...
I heard good things about Velodyne and BIC - but still waiting for reviews of BIC in this forum. Hope this helps.