I have just added an SVS PB12-ISD2 sub to my Yamaha HTR 5250. Both of which I purchased after doing research on this forum!! I have become a Bassaholic and I have the upgrade itch. I want to upgrade my speakers. I am currently using some old Polk floor standing speakers with a 6" midrange and a tweeter, a polk CS-200 center and some KLH bookshelf for rear surrounds. I have $1500.00 to spend on the 5 speakers. I saw an ad on Ebay for a pair of new Polk R50 and R15s for $400 shipped. Would these sound better than the ones I have? and any insights on how someone would have new, unopened speakers for almost 1/2 price? I have never purchased of Ebay but I have heard some horror stories. Or, should I just go get a full matching set? Thanks in advance for the assistance. Rajen.