Help me decide!

which of these makes the most sense for my first pair of hifi headphones? I am also opened to more recommendations.

- Hifiman XS for 170eur

- sennheiser hd650 (HD6XX are not widely available in Europe) for 290eur

- aune ar5000 for 256eur

These are European prices. For use at home. I mostly am looking for an accurate flat sound with the possibility to EQ.