Just getting into streaming and headphones. Bought a iFi NEO iDSD , Grado gs1000e. Sounds great, very open soundstage. For comparison, ordered Massdrop 6xx ( not here yet) and a set of HD 600 to try. Those don't have the ease of presentation or the big soundstage of the Grados and are muffled by comparison. They are going back. Got a used pair of Hi-Fi Man Sundara ordered to try planar magnetic design.
The iFi DAC/pre really opened up my Audioengine HD4 desktops as well.