I have had the Harbeth SHL5s for over 2 years now. The most natural sounding speakers I have owned. Perfect balance of coherence, micro-macro dynamics and frequency extension.
And they perform exceeding well with all sorts of amplifiers. I have had Primaluna, Naim Nait XS2, Jolida 302CRC. Sticking with the Arcam A28 for now.
The Sonos streamer pulls my CD collection from my NAS and I also listen a lot to internet radio like MOG. Very versatile and easy to use multi-zone solution. I have a second Sonos for my basement setup.
24/96 is essential for recording, mixing and mastering; for headroom and fewer errors in processing, but is not a huge difference in the final delivery format. I record, and have several friends who are mastering engineers, so this is my personal experience. The design details of the DAC employed have way more effect than the sample rate used for playback. Again, capture ADC and production are totally different in this regard.
