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

I'll start with my amp findings to date.

From best match found so far (top) to good match (bottom):

1) Primaluna Dialog Premium HP integrated with great preamp bypassing the PL pre-section, KT150s as output tubes--you can read my posts elsewhere on A-gon on my thoughts on this combo
2 tie) Simaudio Moon i-7 integrated (bypassed with same great pre-amp)--very, very close second and best SS matchup--I was a little surprised this handled all aspects even slightly better than the SIT-2 below (perhaps I shouldn't be surprised since the current version of this amp is like $12K)--maybe the tiniest "etch" and maybe "brightness" on really the top end like trumpets and some female vocals that still probably puts this just barely in 2nd for me;  maybe also a slight bit more congestion in complicated passages;  shockingly good tube-like midrange for SS
2 tie) Simaudio Moon i-7 integrated (as integrated)--the pre-section in this is stellar, and to be honest, probably not distinguishable when used just as an amp with a really good pre-amp--hence maybe the best value of all I've owned?  Still just prefer the PL HP, however
4) First Watt SIT-2 (with same great pre-amp)--very close to #s 1, 2 and 3, but a little too short on decay and "balls" at higher SPL--see my comparisons in other A-gon posts

-quality gap-

5) PL Premium HP integrated with KT150s (as integrated)--very, very good, but I think the pre-amp section could be improved (maybe with a tube-roll?)

-quality gap-

6) PL Premium HP integrated with KT120s (as integrated) -- upgrade to KT150s (better than 88s but not as good as 150s)
7) PL Premium HP integrated with KT88s (as integrated) -- upgrade to KT150s (skip the 120s)
8) McIntosh MHA100 Headphone Amp using it's speaker output--shockingly good--never tried it as just an amp, though--not sure I can bypass the pre-section
9) Transcendent OTL Mini Beast with great pre-amp (would have liked a second to bridge and use as monoblocks--may try to find a second before I sell the first...might move up the list as mono's)
10) Primaluna Premium Dialog 2 integrated with KT88s -- probably better if I bypassed it's pre-section but I haven't taken the time to run it that way since finding that combo on it's bigger brother, the HP
11) Nelson Pass Amp Camp amp build--neat little solid state amp, but runs insanely hot and ultimately didn't do it for me
12) Transcendent OTL SE--good but not as ballsy as it's bigger brother the Mini Beast

OK, that's a quick, unscientific run down based on my system, my room, the amps I own and have access to, and my opinion only.  In short, I could easily live and love the top 4 combos, but ultimately choose the tube solution with a great SS pre-amp over the two top solid states, which both had slight long-term downsides for me (the slightest listener fatigue on the SimAudio and the slightest lack of decay on the SIT-2).  I'm being VERY picky here, and feel fortunate to be able to own so many great amps that I can move around.

To note, I'm using a Truth solid state pre-amp from Ed Shilling of the Horn Shoppe--will post my pre-amp comparisons later here.  Also, the addition of a phenomenal headphone section makes #1 PL/Truth the clear winner for me.

For now.  There's 3-4 amps I'd love to hear but haven't had the chance that I suspect will give the top ones here a run on these speakers, but at a cost.

Hey Parsons, tbh I think Soul Supremes and Druids should pair well with the same amps as they use the same drivers - Defs are a bit different as they are tougher to drive. I have heard a zillion amps with Zu, so this is my experience.

For SS:
FirstWatt F7 - I've had the SIT-1 and SIT-2 in my system, but just heard the F7 and thought it was great at the LA Audio Show. I think the rumors are this is the best FW amp now
Valvet class A monos
McIntosh - all of them are good, though the quad balanced amps are best
DarTZeel - a lot of scratch though

For Tube:
Quad ii Classics (which would probably be my choice)
845-based amps such as Audion, Sophia Electric, etc.
Mastersound SEP EL34 integrated 

I am not a 300B fan, so can't help in that direction. With Zu, I tended to prefer P/P over SET but that's personal preference. I generally don't like SET bass.

I'll chime in, as I own Superflys.  I was using FirstWatt amps for a few years (F3/M2), but I'm using a vintage Sansui AU-666 now.  I'm doing a very un-audiophile thing... I bumped up the floor gap on the Superflys to about an inch and I leave the loudness button on at all volume levels.  

Talk about a party... you get the Fender stack dynamics that Zu talks about in their marketing spiel and great tone from the vintage amp.  Bass does not sound bloated at all, it sounds like a decent subwoofer is in the system.  Clarity and resolution is a step down from the FW amps but to my ears the tradeoff is worth it.

Great stuff, thank you both.

I'm coincidentally considering trying an 845 set amp.  Quad II Classics are also a great suggestion...will read up more on those.

I really want to love the First Watt stuff...someone has suggested I need to pair it with a really really good tube preamp rather than SS.  I tried it with an ARC LS-28...the pre had 100 hours on it and I think(?) was broken in, but still didn't totally sing for me with any of the 3 amps I tried.  I know a ton of people love them.  

As for the Sansui--totally awesome.  My Zu Cubes are in a third system with a Marantz 2365 and there are times where I want to listen to that combo more than some of my other stuff.

Atma-Sphere M60 would pair well.