I'm thinking of getting some Aura Bass Shakers for my couch and I've got 2 questions. First, is the Pro model that much better than the standard to warrant the extra 25-50 bux on ebay? Second, what amp do you suggest to power them? I was thinking of getting either the audiosource SW8 or Sony SAWM20 (which is tempting since I have the SAWM40 for my main sub and it does great) and just using the amp to power the 2 shakers. I'd like to keep it under 150-175 total for everything (well, if I get the standard shakers). Or is the effect just a waste of money?