Thank you very much for the information.
From some reviews and tests found on Youtube the Nad M10 V2 does not seem to be the best (they say it is decidedly inferior to Cambridge Evo150) it is true that it is the "old" V2 model but the final stage and various components they say are the same as the new V3 model.
M10-V3 ostentatiously the same price as the C399, with a sacrifice to the aesthetic part that M10 is beautiful! but I would choose the Nad 399, so much more current.
Lyngdorf TDAI-1120? same thought as you, missing Sub output and above all little power.
System with various components, I can not, or rather I could also do it, but I do not have a dedicated place for music and put on different devices, cable, plugs etc. they would be quite complicated to manage, otherwise I would have taken the new Audiolab 9000Q and 9000P series
Very complex and broad topic, also due to dozens of different brands and models that do not help us choose, but as far as possible I would not move from Nad399 or Cambridge evo 150....they are both within the budget, they are practical and functional, you just have to understand which of the two is better sounding.
Thank you very much.