I have a Schitt Magni 3+ and a Modi 3E. The budget is for the headphones themselves. But, perhaps the headphones would be overkill for this AMP/DAC stack. I wouldn't even know where to start to look at used equipment.

I am looking at a couple of headphones, I am not sure what I should be looking at. My budget is $400 USD. I like the Beyerdynamic DT 990. I listen to a variety of music and I was thinking how can I tell while shopping online for a pair which would be good for what genre of music? How can I tell...