Are you going for the HE1000 V2? I heard the original and thought it sort of made music sound like it was wrapped in caramel. Preferred the HE6 even though the HE1000 is better in some ways. But the V2 is reportedly less lush, more dynamic, etc. Haven't heard the Utopia, but owned and loved the Elear.
@x RELIC x owns the Utopia, DAVE, Cavalli Liquid Gold, etc. and generally prefers driving headphones (including the Utopia) directly from Chord DAC/amps. Check out his Hugo 2 review here:
https://www.head-fi.org/showcase/review/18998/
Of course. Chord DAC/amps also function as digital preamps. Basically, the volume is adjusted digitally and there's no added coloration, unlike some conventional amps/preamps. (The amplification is actually cleaner than the output of conventional DACs as well.) Think of it as altering the line level output voltage. They can even drive passive speakers directly with the right cable, though only more sensitive ones for obvious reasons.