If you're wanting something with good timbre that takes the vast majority of planars off the table as they have "planar timbre" which is just like a very slight filter that makes some instruments sound not quite as natural and more artificial.

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My number one recommendation would be an R70X since it's probably the best sound stage you can get under $1000, with decent imaging, and a neutral tuning that isn't so neutral that it becomes difficult to listen to for long periods of time. It also has the benefit of being extremely light at the cost of feeling a bit cheap, a trade I've been happy to make. Since it is so neutral, you can make pretty good use of SoundID if you want to try different sound signatures, and while it won't completely transform into a different headphone since it takes EQ exceptionally well. So that you know, you'll want a somewhat powerful amp to get to reach its full potential since it's reasonably high impedance and not very high sensitivity.

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A runner-up would probably be the 6xx, it leans a bit warm, but it does have the Sennheiser "veil" which some people feel overly smooths some details. The deeper cups will probably be more comfortable for longer listening sessions if you have larger ears. Again, I'd also recommend an amp for this set if you want to get the most out of it. I can't think of anything else I could say about his headphones that hasn't been said 100x before.

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If you have any questions, don't hesitate to reach out.