Hello guys--Audiogon has the NAD at a fair price. I always have liked NAD, I owned an integrated years ago (don't remember the model) that I loved. As I continue my quest to put together my modest system, I would like your opinions on this receiver, and whether you think it would be a significant upgrade from my current Denon AVR591, driving my fronts of PSB B5s and C5 center, Tannoy VR surrounds. Still considering my sub options, though I'm sure I'll go with either SVS or Hsu. Thanks for any help.