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

Lyndorf.  You mean digital amp. Class D is one sort.  Lyngdorf is far better and uses Pulse Width Modulation. See their website: lyngdorfaudio.com. Peter previously owned TacT audio and has been manufacturing these types of amps for 20 years. And they mate perfectly with his Pre-room correction products and now integrated products too.  Best of all is that they can utilize digital and analog inputs, even HDMI. Better overall product than even Bel Canto at a portion of the price! As I said, all class D is is a digital amplifier. Pro audio uses those everywhere. There’s a world of difference here.

Nord Acoustics, when you call talk to Colin North he will fill you in on whatever you want info wise and set you up with a great deal, plus they Nord are in the UK. Products - Nord Acoustics  Nord One SE MKII

+1 Nuforce/Nuprime, particularly with Bob Smith's TDDS factory authorized mods. I had their monobloc Reference 9V3Se, then Reference 20 and Now Evolution One. Have heard many other class D and these are best I have heard. Disclosure, my Reference 20's are up for sale here, but with sale pending. They also use an original design versus standard or modified chips

NAD doesn’t get a lot of love on agon, but you might want to look at the NAD M22 v2.  Paired with the NAD M12 pre/DAC with BluOS module, they drive my Tannoy 8 dcti speakers quite well.

 I like Stevecham am enjoying my M700's .They can't be beat for the price. Collectively, a system costs are considerable so when you can get great performance and save a few to put into other areas in your rack you can get better balance. Steve, I would highly recommend getting a Furutech IEC and AMR fuses for the M700's. Those 2 tweeks made a considerable difference. The AMR fuses are awesome. I preferred them to all the others I've tried including all Synergistic fuses. Trust me.