Integrated for Magico A1

The Magico A5 is an exemplary audiophile speaker exhibiting clarity, detail, tight bass, transient speed, and excellent micro and macro dynamics.  It deserves an integrated amp that can dance elegantly with the speakers; an integrated amp that  will complement and reinforce the speakers attributes.  Your list is notable and any of them will work adequately, but in my experience the list falls short of the goal to dance to the artistic and athletic ability of the speakers are capable of.  To that end, I will list my favorites of those I have auditioned, in order of my preference.  A budget is not listed.  My list is costly, but most can be taken for 50% pre-owned.  Each have their own sound pallet.  So you must audition with the speakers.  

1. Audionet Humbolt: Best I have heard.  Above my means.  No streamer/DAC module.  
2. Burmester 232:  New model so not available on the pre-owned market.  I love the Burmester house sound.  I have the previous model without a streamer/DAC module.  Refinement, tube like sweetness and imaging.  My speakers efficiency is 86dB and there is no problem driving them.  The A5s efficiency is 88dB so it should not be an issue unless you have a very large room.  
3. Boulder 866: a little more warmth than above.  
4. Solution 300:  More cool and technical to my ears. 
5. D’Agostino Momentum:  More dark to my ears.

Good luck.

Hegel is not up to the level of refinement to be a synergistic match with any Magico loudspeaker. 

I had a long conversation with Alon Wolf during which he expressed an admiration for Hegel amps and said it’s one of the amps he uses in voicing his speakers. 

How about the new Audio Research I70? It has optional DAC and moving magnet phono preamp modules. A nice match for the A1.

The Magico A1 needs many high quality watts and the highest current possible to maximize its potential. Hopefully Magico will update the A1 and increase efficiency and be less placement sensitive. FWIW have never seen a Magico loudspeaker mated to Hegel amplification at a show or Youtube video(will check again).

Check out some of the Simaudio gear.  Can be done in 1 or 2 boxes (integrated with Pre/DAC/Streamer/Phono - new 371 for one box or 390/330A or North 791/761).  All are high current designs.  I'm running 390/330A with Magico A3s and it works quite well.