I'm about to return a pair of JBL S26 I purchased. and I'm looking into a pair of Polks as mains (I already own a pair of rt25i's as surrounds). My question is should I look into the new rti series or get the older rt**i at closeout prices. I have the chance to purchase a pair of rt600i's for $299/pr or the smaller new series rti28 for $280/pr. Which one would you buy ?.....I'll be using them with a velodyne sub.