Thoughts on Simaudio 400M driving Magico Mini IIs?

Does anyone remember the high praise heaped upon Magico Mini IIs way back in about 2010? Well, I happen to own a pair of these and will probably never get rid of them. What I am considering is an amplifier upgrade and, after considerable research, and preceding a forthcoming live demo, I'm curious to hear what the Magico devotees among you think about pairing the Mini IIs with Simaudio 400M monoblocks. The Minis are 4-ohm speakers, with recommended amplification between 50w - 200w, which I find to be an underestimation by a longshot. Right now I'm driving them with a Musical Fidelity M6PRX dual mono amp (230w @ 8 ohms), which is a decent match for the Minis up to a point. The Minis are notoriously hard to drive, and the Simaudio 400M would barely breathe heavy with 650w @ 4 ohms. The upgrade in amplification plus going to monoblocks I think would bring out even more of what makes the Mini IIs so exceptional. I have a relatively small listening room: 11(W) x 10(L), with 10’ of open space behind the listening position where there’s a king-size bed. Good for sound dispersion but 10’ from the front wall is as far back as the listening position will go. The room is a dormered attic with an A-frame ceiling that peaks at 9’. The room is well treated with some Rockwool DIY panels I made myself. You can see pics here:

https://systems.audiogon.com/systems/9016

I listen mostly to jazz, Americana, singer-songwriter, electronica, blues, and some hard rock. Another option I was considering is a Hegel H30. I know the Minis are typically paired with Pass, Rowland, VTL, Mark Levinson, to name a few. My local dealer sells Simaudio, Hegel, Audio Research, Spectral, Belo Canto, Musical Fidelity, and Boulder. So these are what I can reasonably demo. I'm looking for something that can easily drive the Minis with headroom to spare. What are your thoughts?