@kennyc, you may want to reconsider your speaker choice since you already have Constellation amps. I heard from a reputable source who has Magico S7’s that every time heard Magicos paired with Constellation amps, which happened numerous times going to dealerships and HiFi shows, the rigs sounded absolutely terrible.
I’ve had the A3s just over a year and am about to try my third amp. I thought I was happy with the PrimaLuna EVO400 power amp but isn’t it funny how listening to someone else’s rig seems to identify weaknesses in your own rig?!
I got a great deal on NAT Generator monoblocks. looking forward to hearing what they do in the system.
Good luck!