I would have loved to hear how the XA160.5's worked with them - or rather how he thought they sounded. I keep pestering PeterA to bring over his pair to try with mine, but he makes excuses like they're heavy or something <shrug>.
Would love to hear Boulder too. I have no doubt that each amp will sound very different with these speakers.
I am listening to an old pair of Mark Levinson ML436 (400w at 8ohm, 800 at 4W) with the Alexia. Although they do not have the holography or the touch me characteristics of the Audio Research REF150, the bass control and depth is impressive.