Zu Soul Supreme Recap -- Owners, what are your preferred system pairings with them?

I'll save a long backstory, but in short I've got the Zu Soul Supremes and I absolutely love them for what they do, at least in my relatively small (13x15x9) listening room.  I've had them a couple years as a follow-on to previous Zu speakers (Unions and Cubes, which I still own).  Those followed some vintage Altec horns (16 ohm Valencias and 19s)--which I love, but love the Zus more for daily listening.  Sean recommended the Supremes over the Druids at the time for the size of my listening room, although I suspect the Druids would have been as good or better regardless.

My interest is to hear from other Zu Soul Supreme owners...not may posts in this forum from owners that I can find.  I'd prefer to focus this discussion on the Soul Supremes, as there is a lot of great info already on the Druids and Definitions (which I assume are more prevalent in the wild), even though I'm sure have a ton of overlap in system synergy.

So...

What system components are you finding to be great/phenomenal matches to the Soul Supremes, what have you compared them to, and what hasn't worked as well?   Anyone running them with what you consider to be really high-end gear?  I'm super curious to see how far these speakers can go before a speaker upgrade makes way more sense.

Jay