The Ayres sounded very nice with the WP7s and other Wilsons I used to listen to at my dealer's, as did the Accuphase 50 watt integrated, a surprisingly sweet amplifier. I'd say you wouldn't go wrong with any of the amps you mention as well, just don't go for something too lean or the speakers might get a little too analytic.
While Spectral often is paired up with Wilson and I have heard it sound quite good at a dealer, I would not suggest it without an audition unless the preamp was also a Spectral unit. As good as the amps are individually, they are intended to sound their best in an all-Spectral system. Not sure how the Spectral amps would sound with your preamp.
While Spectral often is paired up with Wilson and I have heard it sound quite good at a dealer, I would not suggest it without an audition unless the preamp was also a Spectral unit. As good as the amps are individually, they are intended to sound their best in an all-Spectral system. Not sure how the Spectral amps would sound with your preamp.