The ATH-AD700 stopped being made years ago though. And that is a shame as it is about the only pair of headphones that I now have confidence will last me at least the same number of years I've had it already (nearly 10 years) They are touch even if they can get dents easily and the cable and connector is the best I've come across.
I am more or less wanting to go the same direction with my next pair, getting an easy to drive pair. My main area i like is certainly treble, but the AD700s are very lightweight in bass. Still enjoyable, but you can miss it at times.
If you can find a pair of Ultrasone Pro 2900's, they might be right up your alley. Quite well built, nice bass, and elevated treble. You won't get them new, but can often find them for about £150 on the bay. Honestly, it's difficult finding an open back that is well built, has comfort, has good bass and elevated treble for under £200

Going with Philips again, you could try the SHP9500's. They tick almost every box, aside from the fact they have a rolled off bass response. Although, it's largely comparable to the 880's. £150
Other than that, and my previous suggestions, I am out of ideas. And I suspect others will be too haha.