TVD51,

I'm running Hsu VTF 2 (www.hsustore.com/vtf2.html) which I love. One of the nice features of the sub is the ability to configure it for either lower bass (down to 25 Hz according to Hsu) response or a slightly more powerful bass response which is better for movies. I've never hear the other two subs so I'd be hard pressed to make a comparision, but I would put the Hsu on your check it out list. Don't know your budget but they are running around $449 right now.