As I began reading your original post, the first amp that came to my mind was the IDA-8. It’s great for desktop or small rooms. However, it does have its limitations. It isn’t designed to power big floorstanding speakers or low sensitivity speakers like your Harbeths in a big room because they’ll tend to be a bit thin sounding. As Mike_in_nc mentioned, it digitizes everything, so you won’t be able to use your external DAC.
Have you looked at the Omnia A300? 150w/ch with built-in streaming capability and even a headphone amp all in one package. It’s not as warm sounding as the IDA-8 yet is also not analytical sounding. I quite happily use it to power my 86dB two-ways.
I’ve bought a fair amount of Nuprime gear from John Casler (check the Nuprime Circle on the AC forum) over the years. I’ll wager you can do better than the MSRP.
Michael