I am moving into a new house with a semi large den area with my parents and am trying to get rid of myself of my HTIB Kenwood system and move up to something with a little more detail and power. My budget is around $500-$600. I can go a little more but I would like to stay close to that. This room has 18 ft celings btw if that makes a difference. All the systems I have seen on ebay and other sites have been the small form factor systems but I want some towers and a center than can put out some nice mids and highs. I already have a nice JBL 12" 250watt subwoofer so all I need is a 5 speaker package. Any ideas? Some brands I really like are but I am not limited to these. Atlantic Technology Polk Audio Klipsch M&K Definitive Technology Any ideas?