If I were getting the nDAC I'd be going to the second hand market. Buying a new DAC which hasn't got asynchronous USB is unnecessarily limiting IMHO.
Why not buy the ND5x first?
(having said that I've seen some good value NDX on the second hand market)
I dislike getting a streamer plus DAC (ND)and then buying another DAC. Separating these into 2 products gives much more scope to future proof.
There are products from Melco, Aurender, Auralic, Sonore etc. which are worth considering. I'd be careful I wasn't painting myself into a corner by currently buying what is effectively pretty mature technology where there are a lot of changes happening. Still if it sounds good today it will also sound good tomorrow.
<edit: I think streamer in the amp (272) is a total dead end, which I'd personally avoid >
SJB