Magnepan 3.7i Amplifiers Aesthetix or Modwright? Thoughts?

Have a McIntosh MC-602 amplifier running them now, looking to up the game.  I currently have an Aesthetix Rhea Signature and Calypso Signature, so naturally looking at the Atlas Signature.  The Modwright KW-150SE running as a monoblock via a bridged config though sounds compelling.  Obviously, I would need to demo these.  Question:  Who's got experience with either of these running tough 4ohm loads?  Maggies want serious current, and both of these probably would fit the bill.  My guess the Modwrights may be a bit more airy, which is great, but looking for better control of the bass from 100 down.  Any experience or thoughts shared would be most appreciated!   Thanks!