Which Zu for you

Yes, they do. I can't give enough thanks to Sean. He emailed me back and forth with advice even though it was about a used pair of speakers, and he had nothing to gain.  Zu really is one of the best companies out there. Seriously amazing product combined with customer service that treats everyone equally important. 

In my opinion all Zu speakers sound different and the choice should be based on the kind of room and listening. I bought the Omen Def Mk1b after having auditioned almost all their models. My favorite model was the Soul Supreme; I found them to be more "musical". I ended up buying the Omen Defs because it was a huge deal (nearly half price) and I'm very happy with them. This model is not as refined as the Souls, but can surely rock the house! 
As for amplification, any good quality low powered amplifier will do. I like the chinese tube amplifiers with Zu speakers. Line Magnetic, Cayin and Opera Consonance are great (I'm driving them with a Cayin Mt45 Mk2)!

I have Superfly and I have the Defheads (sealed top half of Definition).  I haven't heard Omen Def, but my Defheads are kinda like the Omen Def with a sealed cabinet and better cabinet build plus the Radian tweeter.  Let me tell you that Radian tweeter makes a difference, especially if you listen to a lot of digital.  I like my Defheads better, but the Superfly are no slouch.  I've used both tube and First Watt solid state amps.  If you want a big, rich deep sound, then probably go for Omen Def.  If you want a more intimate, focused sound, go for Superfly.  As much as I like my Superflys I have an itch to trade them in and go up the Zu line.

I use one of those tiny 3w Chinese tube amps from amazon with my Defheads and it sounds sublime.  How's that for a cheap integrated?

Zus are very revealing of amps.  I haven't used a vintage Marantz, but I have tried 70's vintage McIntosh solid state and Sansui.  They sounded a bit too warm and veiled for my taste.

Thanks for all the great responses.  I suppose my issue is that I have only really heard the soul supreme and Druid v and not any of the omen def or def speakers.  I almost bought the omen def 2 but decided I should sell off my old gear first. The thing I do like about the def2 is the ability to easily add the radian tweeter in the future.  Whoopycat does the defhead also give the emotional connection that the single driver provides? I think I would like the scale the def brings but What I fell for in Newport was the intimate nature of the Druid and my music interests vary but are similar to what Zu plays at their shows.  

Thanks for the info on the vintage amps right now I am leaning toward the Almarro a205 as Sean really seems to like it and it's not too much $$. Have to say though that I did love the pass with the Druid. Much better than the peachtree and soul supreme that I heard a few years back. 

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"!