For over 1.5 years, DT-250 are my workhorse in and out of my home studio. Best pair I have ever had, actually now two pairs (one with leather pads, the other with velour). No other headphone held that title for this long and I have tried MANY, even $1000+ models. Sadly though, not everyone is interested in neutrality.
Channel balance mod is a must though, left side is leaking bass even worse than M50x, but it's very easy mod and 100% reversible.
This bag fits DT-250 nicely and provides general level of protection:
https://www.aliexpress.com/item/Oll...erproof-Protective-Cases-For/32804750400.html
Straight cable is very easy to do, and doesn't require significant investment (cable + plugs, usually about $5 total).
MDR-V6 genuine leather pads will fit DT-250, only the inner foam has to be cut away:
https://www.bhphotovideo.com/c/prod...dr7506_Genuine_Sheepskin_Leather_Earpads.html
This will turn DT-250 into NS10
not quite pleasant to listen to, but with better seal and very revealing about mid range and bass flaws.
Ear pads can be replaced basically plug-n-play, pop out, pop in, done in 5 seconds, unlike other cans, such as K141 or K240 where it takes even 10 minutes and you're risking pinching your fingers.