Thank you for your comments and input. Greatly appreciated. I live in Abu Dhabi and there is not a lot of options and/or brands in the UAE to audition. So my decisions are based on research / reviews / YouTube and this Forum.
@soix thank you for the links. The Etherregen seems like a good option and at a decent price. Will seriously consider this.
@zlone Thanks for the kind comment on my system. I was out of audio for nigh on 30 years. Now with settling down and much less business travel decided to get back in. Wanted a highly revealing and low noise sound system. Thus the Benchmark and Martin Logans. Stack Smoothlan is a great option and will investigte the Audio sensibility cables.
@mclinnguy Another vote for Stack Smoothlan plus the Auva -which is on my list on the speaker side - weighing it up against the Tough Nut speaker isolators .....sigh.
The $750 is a separate budget only for digital. There are 3 budgets - on the old 'envelope' process. This digital upgrade envelope. Another envelope for the speaker isolators and lastly an envelope for separate streamer / DAC upgrade you are all mentioning
Shortlist for DAC, is of course, the Benchmark DAC 3b, and the streamer the Volumio Rivo+. The Benchmark DAC 3b will provide the revealing / low noise synergy with the rest of the downstream components and the ESL's.

