Well, so far, I am perfectly happy with an LG V20 streamer/DAC, Liquid Spark, and HE400i.
The LS has enough power to drive the HE400i with plenty of headroom. The V20, 'tricked' into it's 2v ' hi impedance' mode, lets me use the LS in low gain mode, still with plenty of headroom.
My source is 'always' Amazon Music HD, where virtually everything I listen to is 16/44.1. 96db dynamic range is provided by this setup. Fine by me.
As always, I suffer from 'upgrade-itus' - and the Heresy is calling with it's lower distortion and even more HE 400i headroom. If buying now, I would get the Heresy. But the LS has its merits - beautiful built. Plenty of power. And no distortion that I can hear anyway.