Which Zu for you

Yes, go with a model that has the amazing Radian tweeter.

Zu speakers vary in impedance. Def 4s are nominally 8 ohms, Druid Vs are 16 ohms, Def 4s can be custom wired 32 ohms, etc. Check-out ZuAudio.com. Tube amplifiers prefer high impedance - in some cases (ie., OTL) the higher the better (ie., 32 ohms).

I recently acquired Zu Audio Druid with IBIS cables and use them in a 23x26x9 room. Captivating sound. Retired, I literally have music going 18 hours a day. Do yourself a huge service and talk to the folk at Zu. Their counsel is invaluable to you selecting the correct speaker based on room size and make up, listening preferences and associated equipment. All Zu are efficient leaving matching a room paramount. Never mind WAF. Room correction even artistic diffusion isn't cheap and takes over where ugly left off. Spending time in an schizo looking half home and half padded cell is not my idea of an inviting space. LOL.  Enjoy !!! 

Definitely no room treatments in my set up. The speakers are in the living room just flanking the TV on the wall. I know it's not ideal but it's the only option.

Robert, If you don't mind telling me what type of music do you listen to and do you ever feel that the almarro runs out of steam?

My thinking is moving more toward either omen def mk ii so that i can get the radian tweeter later or waiting to find a really good deal on some druid v. unfortunately, neither option pops up that often. like whoopycat said I just need to figure out which presentation i like better - which is a bit hard without hearing first hand. perhaps next year zu will bring a def to the newport show, although i would hate to be out of a system for another year.

Sorry didn't see the response till today.
The room is oblong like you see in the picture, the main wall is 40 ft. long and the depth is 25. So they are near field really since the couch is 6-8ft. away. Moderate amount of toe-in. 
I'll say that they do require a lot of break-in- or maybe I don't listen enough or loud enough:) Really it took about 6 months to a year but that was also swaps of components, cables etc as thing got better and better. So not exactly break in but more dial-in. That's probably normal and reflects my learning curve. 
The Almarro probably does run out of steam over 85-90db in the listening position. But that's pretty loud. About noon on the volume. I generally don't run them much louder than that. But i think that is more than loud enough generally, unless you are trying to impress someone else:)
I listen to a variety- mix of alt rock, rock, IDM, pop, electronica. About 60 percent Tidal and 40 percent vinyl. The RP3/10x5/schiit mani/ combo is pretty lively and competes very evenly with the digital stream. On digital I've been auditioning the Halide HD dac and the Schiit Bifrost multibit streaming Tidal hifi. different but both pretty engaging. Never bother with CD's or ripped stuff, I have a ton left over from the days and its all crap MP3. Probably will just trash can it. 
You said you really were interested in the Druid, the soul supreme is exactly the same drivers in a different cabinet. In a smaller room I think the souls might be better. The Druids being taller have a taller presentation, and perhaps a longer throw to the listening position is in order. I have a friend with the Druids which is how i got introduced to Zu in the first place. Also recco talking to the Zu folks on the phone and they will have good recommendations. 
Outright the best purchase i've made in music, i get delighted ever time I hear them.