I'm interested in either the Harman Kardon PA 2000 or Parasound 855 power amps. Anyone care to describe the sound quality and power of either of these. They would be hooked up to my Onkyo 696 receiver with the Parasound driving 5 channels or the Harman Kardon taking over 2 channels. As I'm new to the realm of power amps, I'm assuming they could thus be hooked up if my Onkyo has preamp outs. I'd especially be interested in those that feel they would improve the current sound/power. They would be used with my Klipsh RB-5 speakers in my bedroom setup.