Many thanks to you both, appreciate the guidance. A Schiit stack is something I've had my eye on for a bit, but they're very sporadic locally and I don't tend to have the slush fund when they do. I've currently got a little pocket FiiO which is very good for my AT and Sennheiser sets, but this time I'm hoping to check out the desktop form factor to pair with the new cans - they won't move far. Source is usually an iPad - to be honest I don't think I need a DAC for this, I usually just feed the FiiO on Line In from the iPad - this setup won't work on the recommendations above? I'm not opposed to a combo or stack setup, I've got a few DACs around but all PC-centric!