Which Zu for you

I have the Zu Soul Supremes and the Almarro 205a 5w tube SET integrated and as a combo it has some real magic. Sean is right about the almarro. I'm not the only one who liked it either, the one I bought was from another friend who had the same speakers but he was upgrading and wanted a few more watts.  The supremes for me had the same thing as the druids, and I've heard the druids. Btw, the living room pic on the Zu site is my living room. 
I've never heard the Omens so I can't comment, but the amp is v.good. Before the Almarro I used a tiny mini watt N3 which actually was amazing considering what it was. It was definitely "fun"!

I keep looking a Zu but wonder about the 16 ohm impedance.
Are all their speakers 16 ohm? Don't know that much about it, but am lead to believe that pushing a tube amp (Woo WA5 in my case) into such high resistance is hard on the transformer. Any thoughts from those in the know?

Leotis, the twin driver models are 8 ohm.  Omen I believe is 12 ohm.

>Whoopycat does the defhead also give the emotional connection that the single driver provides?<

Yes and no... IMO the Defhead does dynamic peaks better and really puts you inside the music, whereas the Superfly has more of the "you are there, front row" intimacy.  As cobra213 has put in more eloquent terms in other threads, it depends on what you value more.  That said, I'm making the differences sound bigger than they are. 

BTW, my tube amp for the Defheads is similar to the Miniwatt that Robert used with his Supremes. 

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).