Is the only place that I can buy the higher end models SVS subwoofers, from the SVS website directly? I have been waiting for a long time for a PB2 and I have not seen one at all... or any SVS sub for that matter... the only ones that I have ever seen are a couple of the CS models. Does anyone have any other sources for SVS subs or anyone here looking to sell their PB2 and upgrade? I am looking at the PB2 Plus... I'm not sure if the PB2 Ultra is worth double the cost, for me. I'm not sure how much better the drivers can really be! Thank you.