Which Class D Amplifier? PS Audio, Ghent, Nord, Merrill or other???

Gallium nitride (GaN) semiconductors may be desired over silicon carbide (SiC) for power transistor applications because of the greater bandgap of GaN’s 3.4 eV compared to SiC’s of 1.1 ev, but there still exists a fundamental challenge of not being able to grow pure GaN crystals any larger than about 2". This is a limiting factor from a manufacturing standpoint for the general uptake of GaN in power applications; most manufacturers have to use a doped version which is poorer performing and more expensive compared to pure SiC crystals, which can be grown to double and larger sizes. Also, gallium is a rare earth element, silicon, um, not so much.

I have immunity against monkey plague and Class D amplification.

And how many have you actually listened to?

Don't forget https://www.elac.com/product/dpa-1m-monoblock-digital-power-amplifier/

I listened to these and thought they were very good

I used to have GamuT M250i mono blocks & now use Wyred 4 Sound SX-1000R mono blocks & they are excellent. 
FWIW I use them with Boenicke W8SE speakers & Octave HP700 pre.

Speak to Mark at Elite Audio...