Luxman 509x or Simaudio 600iV2 with mágico A3.

I got to speak with Alon Wolf at length in person, and during the course of the conversation and unsolicited he said he really likes Hegel amps with his speakers so you might add them to your list. 

Thank you I had 590 before and wasn't my cup of tea.

The Hegel did not have the refinement Luxman and moon had.

I heard the A3 with the Mark Levinson 585 integrated. It was a really good pairing. I have heard the 509x and found it a little underpowered even with Harbeth. I have not heard it with the A3 which are likely harder to drive. I also felt the 509x was a cleaner sound than the Hegel integrateds and separates. The A3 seemed to like power based on how my single stereo Benchmark AHB2 sounded terrible with them.

I have owned 2 integrated amps that would be great with the A3. The CODA CSiB and the KRELL DUO XD 300i. I think a little warmth matches well with the A3.

I have heard the prior top end SimAudio gear, and I am not sure if it is a good sonic match with the A3.

I have owned a Luxman L-509u powering Verity Audio Parsifal Ovations speakers and more recently a Luxman L-595A integrated amp.  I own a Sim Audio Moon transport and have looked at some of their amps but have not had any in my system.

The Luxman build quality looks to be at a higher level than Sim Audio.  Not that Sim Audio is bad, just that Luxman is more refined.