R70x was my endgame. I got them on their release date 6 years ago and haven't bought another pair, except some Koss KPH30i because I needed a phone headset, and that also happens to also be a great headphone.

Expense has so little to do with anything for me. I've owned multiple flagships and heard l many of them. They weren't as good for my tastes.

The K371 might just be your jam.