yeah, i know the order in which things should be upgraded/how much of the allotted budget should be spent on what. in my case, its purely for a top tier CIEM on the go. one could argue i should get a better DAP first, but convenience (and portability) of driving them out of my phone is unparalleled. for that reason, i don't want a portable DAC/amp either. maybe i'll want a usb dac/amp for home listening because they hiss out of my laptop eventually (to a lesser extent, my phone hisses as well), but i haven't found one with the sonic qualities i want, which is neutral to slightly bright.
to my understanding, since CIEMs have low resistance, the impedance of a given cable will have an affect on the sound.