All the amps above are good performance/price ratio. And I've tried all of them except the Ayre 5vx. I had a pair of Belles 150A Reference Monoblock, McCormack DNA-500 and now have a pair of Parasound JC-1 monoblocks and a pair of Belles 350A Reference monoblocks. As good as the Belles 150A HR, the reference is another league especially the 350A Ref. Check out their web-site http://www.powermodules.com and see what the former retired dealer rave about the 350A ref.
Steve
Steve