thanks Bill,
i did look at the XPA-3, but have learned of complaints about noise level with the XPA and heritage speakers, so i toned down and opted for the UPA series for its quietness.
in a way, i wasn't completely surprised, since i knew the 805 had an excellent amp (actually delivered around 120wpc with 5/7 channels driven).
i was hoping for a notinceable difference right away, but i guess if i spent enough time i might actually spot a few things.