Average build quality but I'm very good value for money.

I'm a Sundara. People generally like me but I'm prone to breaking apart after light use.

Simple solution : use the Tygr 300R for music, use the PC38X for gaming.

I can only comment on the HD6XX : the sound is very intimate. I would never use them for classical. I love them but I only use them for music that I want to sound like it's happening completely inside my skull ( for me : VU's "The Velvet Underground" or Rapeman's "Two Nuns and a Pack Mule.")

Yes, but THWIP would show up on discogs. as would Two CHilekings.

Oh thanks! I also checked https://www.discogs.com/search/?q=THWIP - no result.

Also thank you for the introduction to the music, shame they never made it, he was a talented bass player.

Looks like THWIP was never released after the death of a band member.

Digicharge 19X23CM headphone case - ebay item no.203497721437, Amazon B08Y5XCJ79 . You will need to unplug the cable. The strap with Velcro keeps the headphones firmly in place.

I just tried my DT990 PRO in one of these, a perfect fit except for the non-removable cable. Your DT900 Pro X has, I believe, removable cable and has the same dimensions as the DT990.

I cannot say that the HD6XX sounds boring at all. I find it intimate and compelling although I prefer Sundara because of the sounds which seem to come from way outside my head.

"hope that these last at least a decade" - in that respect you may have been better off buying the Sennys - I'd happily launch them across the room and expect them to work fine. I cannot say the same for my beloved Sundaras. Just take good care of them, avoid dropping/throwing/ abuse.

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Edit to add : that is a mighty fine 1st set-up, you have good reason to be proud of it. Thinkpad posse represent.