Just wanted to jump in — I’ve had the chance to hear the HD800S with both the McIntosh MHA200 and MHA150, and it’s honestly one of the better pairings I’ve come across. Big soundstage stays intact, but the McIntosh adds this rich, smooth character that really fills things in — especially nice for more dynamic recordings like Mahler or large-scale jazz.
I’d definitely say try the Ayre first since you already have it, but the McIntosh headphone gear is no slouch. If you get the chance to hear it, it might surprise you in a good way.