It doesn't surprise me at all that the $750 Intel NUC sounds close to the $6000 Aurender N200. While it’s not exactly an apples-to-apples comparison, we had a similar situation recently with a customer who is replacing his Vivaldi Short Stack with a miniDSP SHD running Dirac Live. The surprising issue for him was that a $1,400 multifunction preamp/streamer/DAC/Dirac component could even compete sonically with an $80,000 digital system with DAC/Clock/Upsampler.
The comment I always get a kick out of from high end audio customers is that their biggest concern with the miniDSP SHD is that it doesn’t cost very much money.