I'd like to throw a 3rd option into the mix, and that is the Merrill Audio Taranis. Just posted a review of it. Was considering a new power amp myself and the A21 was on that list. Went with the Class D Taranis. 100K input impedance and running it with a tube preamp. Very large amount of power. Does not sound lean. You can home audition the Taranis courtesy of Merrill. Audio Advisor will allow a 30 day trial of the Halo if you wanted to compare the two side by side. Personally, found the 60 pound weight of the A21 a little intimidating. Good luck in your decision.
Parasound A21 or Odyssey Stratus
Switching from Rogue tube integrated because it's too lean for me. I have Monitor Audio Silver 8 and I like to play it loud sometimes. Mainly with rock/hard rock. Considering the A21 but not sure it's worth the extra $1000 over the Odyssey. Any thoughts out there? Thanks!!!!