Which Integrated with Magico A3

Why an integrated? While there are good or great integrated amps, don’t do it for sound quality when what you currently have is pretty stellar. 
 

I could see depending on your listening level you may want more power than the 30.8 can provide. 

Possibly a darTZeel CTH-8550

I drive my Magico A1s with an Accuphase E470 & it’s complete bliss.

The E470 is class A/B though, so it doesn’t break a sweat handling the A1s with 200+ watts into 4ohms.

The newer version of my integrated is the E480 or Accuphase also has two Class A integrateds if you want to stay with Class A.

I would recommend posing the question at the audio aficionado audio forum. The kind of equipment you are talking about is common fare for that user group. 

stick w pass if you like the sound, finding something you really like is progress in this hobby