It really depends on how you listen and what you appreciate. Audiophile is kindve a loose term. There is technically accurate, high resolution, good tonality, things like that that are more objective. Expensive headphones don’t generally have the same price/performance ratio as speakers. They don’t keep getting that much better past a certain price. Find something that suits your tastes and if you love it, it’ll be worth the upgrade. It’s good to try some stuff out and decide for yourself what might be worth the upgrade. I’d check out hifiman, beyerdynamic, and focal. They have good variation in sound signature and offer some very high end options. Also easy to find and try which is the most important. I’m assuming you probably don’t like sennheiser but they make some seriously good models as well.