@equedadoii
it's because the Aune X1s has an analogue input that I mentioned specifically that the Mojo has none. You are correct that the mojo will cover your requirements; laptop>DAC>headphones.
The Aune X1s will
also function as a traditional headphone amp. Meaning it will amplify from a device with a headphone or line out. (Eg like the headphone out from a laptop, or from a portable player that doesn't have a digital out.) Some headphone users prefer to use a headphone amp between their source and headphones.
The I think the Mojo will not power from the USB input. I have the Meridian Explorer and it requires no other power than the USB port it runs on. Therefor I understand the charging method you mean. However I believe the Mojo needs to be charged on the USB power port. I think I read it needs a 1A (amp) charging source. A single USB port is only 0.5A.
I like you, think I will be using it mostly for at home sat next to my PC. (Music and gaming nirvana.) However I do intend on using the Mojo with my laptop away from my PC. Also I am thinking about buying the Sony NWZ-A15 to run with the Mojo. It has unrivalled battery life for a DAP, and I don't need an optimal sounding DAP with a Mojo. Thus I see myself drifting for countless hours in a trance somewhere comfortable; Sony DAP + Mojo + Grado.
I really am just going to have to bite the bullet and choose some higher end Grados to go with it. The 225e I have are OK, but for ages I have been deliberating on an upgrade. I have sneaky feeling the GH-1 is the headphone I would like best. For now though I am intent on sometime soon I hope, putting wood cups on my 225e.
NB. Yes the Mojo will be perfectly balanced with your Grado headphones low impedance. Ref you question on the Mojo page.
@Krutsch
I am not quite sure what you mean. You are correct Chord do no use ASIC DAC chips which I said. However the programmable FPGA they use is not a filter as far as I understand. Anyway if you're correct and it is, fair play and I accept. However in the marketing for Chord products it clearly says they use their own coded FPGA and not off the shelf DAC chips.