I've had the Bel 600 monos and they were nice, Haven't tried the PS audio. However, the Bel 600 weren't as good as the either a Luxman and simaudio Int I had. I sold the Luxman as well as the bells. I am using the Sim 340i and an amp at the moment. I will sell soon and look to go with a true power amp. I don't know which brand yet. I also use a PrimaLuna and that beats all of them. I do enjoy switching between them though, just a slight change in sound.
I liked the Class D for the low heat and instant on feature, however the sound wasn't quite there in my system. Focal speaks, steaming Tidal and a Mytek Brooklyn DAC.