I’m sure there are a lot of questions like this so I’ll try to be detailed and to the point: I’m looking at something like the Topping D10 and Schitt Heresy or the combo IFI Zen for a desktop headphone setup.
And a main question is other than budget or the benefit for future upgradeability if I will notice a significant benefit from the stack. I expect the stack to be cleaner but not sure if I would actually notice. And I’m not very concerned with balanced output, but it’s an option.
Currently I am using the 58x and Sivga 004 from an AD18 (primarily for the Micca RB42 but which might not be ideal for headphones) and the built in DAC of the MH751 for my desktop. At work I have a K3 and the Sivga 006 for a cheap but decent work setup. I don’t really need anything super high end or anything for hard to drive headphones, I’m mostly using spotify as a sound source. I think the most I’m going to upgrade to in the near future would be the Sivga P-II/Sendy clone or the M570.