I know fairly little on this subject, but I'm looking into getting a new pair of headphones. As per the thread title, I currently have a headset, the Sennheiser PC 360 driven by the Asus Xonar DG. I've already been looking at the Beyerdynamic DT 880 Pro 250 Ohms and also the DT 990 Pro 250 Ohms. Also very much interested in the Sennheiser HD 598, 600 and 650 - the latter two are a bit higher than my preferred budget, though, and I am unsure as to how much better/different the HD 598 is compared to my PC 360.
Copy-paste from my post in the /r/headphones thread that didn't seem to yield any replies.
Budget: Up to 250€, ~$340 - somewhat flexible but I would like to get an external DAC + Amp in the near future, so keeping the price down a bit would be preferable.
Source: Asus Xonar DG
Requirements for Isolation: Essentially none. I am fairly sure I very much prefer open headphones.
Preferred Type of Headphones: Full-size
Preferred tonal balance: Overall balanced, I think
Past headphones: Sennheiser PC 360 - it's a headset, but as far as I know, it is essentially an HD 555 or 558 with a mic. Also various cheaper headphones. Examples include some of the cheaper offerings from Sennheiser (HD 200 and tried HD 419 briefly).
Preferred music: Post-rock, math rock, classical, ambient, some jazz, nu jazz, some metal
As I said, I would like to get an external DAC + Amp in the future seeing as the headphone amp on the Xonar DG only goes as high as to about 150 Ohms (I think? I recall reading that somewhere at least). I've been looking a bit at the Objective 2 ODAC combo and it seems pretty good, but it is also at the more expensive side of things. If you have any suggestions to this as well that'd be great. I would like it to work properly on Linux as well as Windows. Bear in mind that my listed budget is for the headphones only, not headphones + amp.
some guy with two hands