I started by getting recently the LG OLED77CX and now want to upgrade my sound system.
So, did you get something already or are you - like me - still searching?
I've basically narrowed it down to:
NAD M10
Lyngdorf TDAI-1120
Bluesound Powernode 2i (with HDMI)
Sonos Amp
HDMI: The Sonos don't support eARC (just ARC), while the other 3 has.
All support Airplay 2. The Sonos supports Apple Music (but I'm gonna stram from my MacBook Air 99% of the time.)
Price: The Sonos is slightly cheaper than the Bluesound, while the Lyngdorf and NAD are 3 and 4 times more expensive that that Bluesound, respectively (at least here in Norway).
Seeing I went overboard with the TV, all sensibility points to the Bluesound Powernode 2i (with HDMI) as my replacement. It is slightly underpowered (≈ 60W), compared to the other 3, but I have a small living room and never, ever blast my current Denon CEOL Piccolo (≈ 75W) anywhere near maximum volume.
The Bluesound wins all comparisons I find online, punching well above it's price range, and even though audiophiles will prefer the Lyngdorf (or the NAD), I think it's more than good enough for me...