I don't have the experience or the ears that people have up here, as I am only audiophile level 2. I came to Changstar after being a bit frustrated with trying to find a headphone I could love. My HP journey started a few years ago when I purchased the vModa m-100. For a brief time I enjoyed them, but quickly got turned off by the big bass. Then I tried a few more cans, like Senn Momentums, PSB M4u 1, etc. Finally settled on the he-400s. I liked these for awhile, but soon the recessed upper mids and distortion in the mids started to really bother me. I gave them to my father, who only listens to classical, and they do alright for that.
When I came here and asked for advice, people recommended the hd600/650 with a tube. And purrin had a rig recommendation for these with the modi and vali. I was skeptical, like I had this idea that these were old school. But I picked up the hd650s about 6 months ago, and soon after the wyrd, modi 2, and vali. And omfg, this has been a life changing sound. These are really easy to enjoy. The tonal balance just drips with joy.
I am indebted to the people here who got me going with the hd650s.