Any reason why you haven’t tried the HD800/HD800S yet? That seems right up your alley. I also think you might enjoy the ZMF Auteur and the MrSpeakers ETHER Flow. If your budget can support it, I’d also strongly recommend the Stax L700 with the 353X, which I think would fit your tastes perfectly.
You probably won’t care for the 660S or the ÆON Flow Open - both of them run on the warm side and neither one is super spacious. Of the two, I think you would probably like the 660S more, but I actually think the ÆON Flow Closed fits your tastes better than the open one - it’s more neutral and less warm, so in effect, it sounds more spacious.
Still, my top 3 picks for you would be L700, Auteur and HD800 on a warm setup.
HD800/S hasn't been available for listening at any store I have been to. I have heard that HD800 vocals sound distant and it isn't very engaging but the soundstage is massive. I'm not really into massive soundstage; I didn't like AKG K712 Pro which had large soundstage.
Auteur and Ether Flow sound interesting, though they don't have a dealer in my country so I would have to buy them without hearing them. Stax L700 itself may fit my budget but with Stax amp it is just too expensive (both together cost around 3000€ here).
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