All in one unit for headphones- help me decide

Your headphones deserve an amp that’ll get the best out of them and highly doubt you’ll find that in an all-in-one unit.  I’d find the right headphone amp and get a separate DAC/streamer to handle the rest.  Is it really worth the sonic compromise just to have one box instead of two?

@soix - point well taken.  I am treading a bit softly here as the last time I really lived with headphones was in college 40+ years ago (had stax electrostats back then).  So perhaps I view this in two steps, with the second more expensive step going the route you suggest after I have lived with a one box set up and confirmed my headphone life is here to stay.  I figure with my just purchased HD800S and the Naim or Auralic, my investment is in the 5-6k range, which is a pretty easy step to make before upgrading to something more serious and delegating the all in one to one of the kids or grandkids.

@meiatflask If you truly want to go a budget route, I'd consider a Poly Mojo2 as your interim step - it's a portable headphone amp and you can get them $500-800 (used/new).  You can connect it to your phone or external streamer (including Chord's poly).  This can then become something you can use for travel or share withe kids or grandkids.  I think you'll appreciate your Sennheiser's on it. 

All-  I ordered the Naim atom headphone edition, and should take delivery on Saturday.  So thanks everyone for your advice, comments, and help in my decision.  I’ll follow up with a post in a week or so to let you know my listening experience.