Whatever you do stay away from the HiBy R2 II I will return mine tomorrow. Bluetooth is really bad and (minor problem) had to put the music in the micro sd directly from the computer. Also, connect it to the NAS is not an easy task.
As
@Guermantes says an old phone (with a DAC) is a good option, I have one in the dinning room connected to a stereo, I don't use Poweramp, I prefer USB Audio Player Pro.
I will follow this thread because I still want a little DAP for those times I travel (12 -13 hours in a bus is not a joke) and want to save cellphone battery.
About Hidizs AP80 PRO-X, I read that the difference with the Hidizs AP80 PRO is that it decodes MQA and doesn't have radio, that and the price. BTW I understand that the Hidizs AP80 PRO decodes MQA at software level, anyway, I don't use/understand MQA and probably never will.