Luna

A very nice review, I enjoyed reading it. The Luna is a fairly technical headphone. This setup seems to have been designed with the Harman community in mind; you get tight, booming bass without any midrange interference. Mids? Slightly retracted, yes, but still natural, with a good sense of body, especially for male vocals. Highs are clear, perhaps a bit too confident for my taste, but also smooth. No treble, no skull-piercing peaks. Imaging is solid, the soundstage... not bad, nothing holographic, but not claustrophobic either. My opinion: If you're into a more relaxed, bass-tilted, engaging listen — get the Luna. "If you're chasing that reference-style, mid-centric, audiophile-grade clarity — Arcanis is the one."

The Luna is amazing!

Luna or Horizon. I live my Doscincos, so I’ve turned into a big fan of Ziigaat!

I really like the Ziigaat Luna

For my desktop setup I recently purchased a FiiO K13 R2R DAC/amp and absolutely love it. It's a nice upgrade from my old FiiO K3 and it's spendy, but according to many reviewers/experts it's a great value and sounds as good as some more expensive equipment. I use AKG K702 headphones (open back) and just recently got my first IEMs, the Ziigaat Luna, which are astoundingly good reference IEMs despite not having the kind of soundstage I'm used to with my headphones. The clarity on the mids and highs in particular is great, and I can tell these have 6 drivers each. It's nice to rotate between these during long sessions as headphone fatigue is a real problem for me as I wear glasses. At home I have maxed out sound quality settings on Tidal. I got a cheap USB-C DAC/amp for mobile listening. Honestly, even the Apple one would be serviceable for most IEMs as they are low impedance. I'm going to try bringing the IEMs on the go now but have been using AirPods Pro for a few years so it's going to be tough going back to wired earbuds despite the higher audio quality. To keep the hi-res setup on the go I usually pre-download a bunch of stuff I want to listen to on my phone while on Wi-Fi as my 5G can randomly drop out on the bus or at work. I wouldn't rush into any purchases—do your research, buy something that fits your wishes, and you will be rewarded. That being said, from my experience almost every audio upgrade in my life has been worth it haha. Side note: If you're on a Mac, Tidal is great due to its exclusive mode setting, which allows Tidal to control your audio settings and automatically achieve bit-perfect playback for whatever sample rate your tracks are. This was the reason I switched from Apple Music last month.

Your going to want a Ziigaat most likely just due to the very wide spectrum of genres you've presented, Crescent(my favorite Ziigaat) Kiwi Ears Astral, Ziigaat Luna, Soft Ears Volume S. Other then that, I ran out of my own personal experience to dive any deeper, I suspect that with the Luna or Crescent you'll be super happy IME.

Obviously the ZiiGaat Horizon looks interesting as it's their first foray into planars. I've always quite liked the ZiiGaat Doscinco and the ZiiGaat Luna. Only ZiiGaat iem I currently own is the Cinno.