Second everything @ruinedx says above. The 820 has really grown on me. I was a bit skeptical at first, with its unusual tonality and frequency response, but I’ve really started to fall in love. I’ve been using a Schiit Loki to play with frequency response, but sounds great without. It absolutely obliterates my Beyer T5p.Thanks! I think Id go with the Hdv820. By the way how do you like the hd820? I see so many mixed opinions, it seems polarising.
I would say, if you think you like a lot of low-end slam, you might consider a Spirit Torino. Haven’t heard myself, but from what I’ve read, they make super, super detailed headphones with the most bass in this level of high end. I’ve been thinking about buying their Radiante closed back, which is similar price as 820. They’re also supposed to take EQ really well.