I have been thinking about an "endgame" headphone system and considered trying to match cans with an amp. I have always liked Sony so they made it easy by building what they are calling their own end game system, "Sony Signature Series":
The culmination of a lifetime’s pursuit of audio excellence, Signature Series products transcend the limits of high resolution sound, achieving an unparalleled listening experience.
I bought the headphone amp/dac/pre and will see how it performs as a DAC and a 2 CH preamp in my home theater before getting the matching cans.