I have been happy with my audio system for sometime, but am trying to figure out what might be the best upgrade or improvement I can do... I have RT800's purchased in 1999, a PSW350 sub, and a Harman/Kardon AVR65. My thought is external amp as the AVR65 does have Preamp outputs. With kids in college I have little $ to invest, but have also considered upgrading to the RTIA9's or upgrading the AV Receiver. Any thoughts as to what you would do to upgrade? Thanks for your input.