I currently own the SOMY HTiB DDW-840. It is hooked up to a 61 SONY RPTV without HDTV. I will purchase a new DVD player this week to replace the GE player that froze. I plan to purchase either the JVC XV-S500BK or FA900BK. My question is where to start my upgrade of the audio/speaker system. I can only upgrade one piece right now, so should it be the center speaker, front mains, receiver, or rear speakers? My budget is limited to $400. THANKS