Frozen is nice ._. Well, not the ending. So Disney - like ending. Find myself singing the songs in my mind specially "For the first time in forever" not sure why pretty catchy. I'd say 9/10 mostly because of music
The DT880 is a tube thing. Best to pair it with a tube amplifier for warmth and to fix the brightness. There are plenty of budget friendly tube amp/DAC from Anue, Bravo, xDuoo.
Do you currently have an amp? Are isolation essential?
Hope it helps
I see you have 3 IEMs costs the same price. I believe they are specifically targeted to some users?
Thumbs up for your story as well xD Good head start
Wish you a successful business!