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

I'd have to say the Nuforce or Nuprime class D amps are definitely amongst the finest.  The ones Bob Smith at TDSS upgrades are THE finest and up there with the best sounding amps made.  I've tried my Nuforce Ref 9 V3 SE mono amps in at least 5 different systems with different speakers.  In all 5, the owners and all who heard said it was the finest the speakers and system had ever sounded.  Before the upgrades from TDSS, the amps were already very well reviewed and sounded very good.  After, they are more reliable and sound better in all the different parameters by a very discernible amount.  I've not heard all the different class D amps, but these amps I now own leave nothing to lust after.  They have power, great bass, detail and transparency, and are not hot on the high end.  They can drive pretty much any combination.  Mine will soon have the 500 watt power supplies installed.  They already had upgraded 350 watt supplies.   

Not class D but I replaced a PS Audio Amp with a Benchmark Media Amp and the improvement was dramatic. I couldn't be happier with Benchmark.

I love my PS Audio's Stellar pre-amp and amp driving Tannoy's.  PS Audio is hard to beat for the sound/cost value.

The Red Dragon 500 are excellent amps.