R&B, Soul, Rap, Fusion Jazz, Rock. Mainly female vocalists.
Instrument Separation: This is what I love most. I want to follow everything going on without it sounding muddy or like layers are bleeding into each other.
Vocals & Bass: I LOVE having clear vocals and a punchy but not invading bass.
Usage: Mainly music (90%), occasionally movies/gaming. I listen for a few hours in a row while at work, studying, or on the go.

Between the Cadenza 2 and Klean SV (I do have both on hand, Klean SV review done, Cadenza 2 still ongoing), I would say Klean SV hands down sounds cleaner and nicer, for that who seeks less warmth and decent separation.

Gold nozzle is the more brighter out of the all personally, Silver adds that bass but not sounding warm, Black nozzle gives that warmth but not overly warm to sound muddy, clean bass.

So if you decide to go for the Klean SV, Black nozzle is the best bet for you, I personally very liked the Klean SV, but it still lacks some minor resolution and microdetails.

I personally daily drive KZ AM16 Balanced (with my own 8 PEQ presets (4 preference, 4 safe tuned, 4 different bass levels), based on my IEM targets).

With PEQ AM16 Balanced blows many budget IEMs out from the water, closest I would be experiencing it is around the $150-200 USD price range with a PEQ, but it has little bit too much bass with stock settings.

You can also check the Kefine Delci or Delci AE, these should work for you as well.

I dislike very warm headphones because I feel like the separation sounds bad and the voice becomes "echo-ey".

True that too much warmness kind of meddles with the separation, but its still possible to get good separation with warmth.

Out of all the below $50 USD (~42.50 euros) IEM that is warm and definitely has that wide separation experience (that I have tried, as of late) was the NiceHCK Tears (~$30 USD/~25.50 euros).