Some suggestions based on what you said:
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Modhouse Argons, they’re not dynamic but are a warmer, darker, and more soundstage from what everybody talks. They are closed-back, don’t know if this is important to you or not. Also can’t confirm on the amp-side, but I think the Zen CAN should be able to drive them ok. Here is the discussion about the can.
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Akg K712, I have them and they have a relaxed and somewhat warm presentation, but not with too much bass. I do not recommend you pay full price though, between $200 and $250 is where I would go (if you’re in the US). They can also be found cheaper in the EU, bought mine for 160 euro. More info on the post.
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If you don’t mind closed-back, maybe look at the Fostex/Denon with biodynamic drivers, from my understanding they’re popular with the bass-heads here on the Forum. You can look them here.
Anyway, not the most experienced from here but wanted to complement/help the best I can. Like @TimpTim44, lot of helpful and experienced folks here on the forum, so maybe have a look around the post of any can’s you like. If there aren’t any post on a specific one, consider creating a topic and if anyone knows it, they may chime in to help.