I stopped buying headphones at HD580. I have enough budget speaker sets as well that I've gotten over the years, all sounding more than good enough, I have no itch for higher end speaker gear. So I only buy IEMs now, which tend to be a lot cheaper, even there I'm close to endgame. So I probably have 1 or 2 higher end IEMs ahead of me, and maybe a subwoofer upgrade, that's it. I see myself getting more into modding and rolling accessories in the future.