From what I've heard, I would decide between:

660S - probably the most natural overall but also muffled. Depends on the recording and calibration of my brain.

HD600 - very neutral and smooth but quite shouty and technically not very impressive.

HD6XX - like something between 660S and 600. Not as shouty as 600 but still shouty and technically mediocre, and not as muffled as 660S but still muffled.

Ananda - very clean and still pretty natural, but also quite shrill and tense-sounding.

M1570 w/velour pads - natural and engaging but fatiguing.

HE5XX - the best tonal balance I've heard but kinda tinny and cheap-sounding.

DT1990 - terribly V-shaped and fatiguing but there is something about them that makes them sound pretty realistic.

The only more expensive than Ananda I tried was Arya so take it with a grain of salt.