I've had the Elise and the Euforia in the past. I'm currently using a DIY Aegis that was just released commercially through ZMF. You've probably read some of this before but the Elise has a more classic tube sound and is better for tube rolling. I found it big and meaty. I've seen it said before that if you want a tube amp that sounds like solid state, get a Euforia. This is KINDA true. It is very even throughout the frequency range and provides more detail than the Elise. It's very clean but still has that tube "realism". I really enjoyed both amps in their own way. If I had to choose, I'd take the Euforia but I did miss some aspects of the Elise and could see an argument for having both. I used them primarily with ZMF Atriums. For a short time, I still had HFM HE1000v2 when I had the Elise. It certainly warmed up that can and I enjoyed it. But I think if I spent a lot more time with it and different genres I'n guessing I would have found it sounded really good on some stuff and "off" on other stuff. I think planars with either of these is likely going to be dependent on the planar and could be hit or miss depending on what you are listening to. Others may have more experience.
I certainly recommend either of these amps but if you are serious about adding planars and if in is in your budget, I'd recommend checking out the ZMF Aegis. It sounds freakin' amazing and has an output switch you can adjust for impedance so will work with any headphone including planars and IEMs. Even powerful enough to run the Modhouse Tungsten. If you were so inclined, you can build the DIY for a little over $2k or buy the commercial for $3500 (currently $3300 intro price).
https://www.zmfheadphones.com/aegis-amp
I see you are in Seattle. If you are ever down near Salem, OR, reach out. You are welcome to bring your cans and listen to my Aegis.