Why would you not want do this with any planar magnetic that isn't highly efficient?
Had great results with my Schiit Lyr and NFB12 with the HE-500 too. Doesn't mean there isn't room or curiosity to try something else and seek out new synergies for a personal preference sound combination. Why not branch into something rather different from typical headphone amps? Why be limited to one kind or another?
OK, OK, point taken.
I'm getting grumpy with my power still out for a week now and no end in sight...