Upgrading my HT which is currently Polk's RM6000, so far i have a csi5 center and fxi3 surrounds(ebay). Will be purchasing rti8's or 10's as mains. Polk is offering a $200 discount on subs and I was considering the psw505 for $300 after discount. Would I be better off spending the extra money and going with the SVS PCI 25-31 at $549 + shipping? 75% movies 25% rock music. Thanks for any advice.