So as a few people have said, this isn’t a question we can answer for you, only give our opinions. Let me give you an example with three of my favorites under 1k.Hmm, this is interesting. I am looking for a headphone, that can be used for most genres.
Hd800 with sdr mod or hd800s. Huge soundstage, excellent instrument separation, fantastic for classical and genres with complicated passages. People can find that bass is lacking compared to others. Best for gaming.
OG focal clear. Great tone, smaller and more ‘impactful’ soundstage. Solid build.
He6se. Does everything the clear does and more (imho) but only, and I mean only, if you have an amp that is powerful enough to drive them properly. With a standard ‘good’ headphone amp I’d stick with the clears. With a otl tube amp id stick with hd800. The adorama version has qc issues with the magnets.
So, basically, what fits your situation? What is your favorite genres? What is your current chain? I’d like to say you can’t go wrong with any of these great headphones under 1k, but you can.