Commodity junk for the masses.
Here: try this at home. Take that $2k you'd have spent on the Denon, go down to your local used audio shop, and buy a lovely sounding old analog amp for 1/4 to 1/3 of that. It will leave the Denon far behind in warmth and pleasure of sound. (This is assuming you already have speakers that don't sound like Glenn Beck with his head up his ass.)
Then spend a couple hundred on a decent entry-level DAC; the field's crowded with good choices. Put the rest into a used Mac Mini and external HDD.
Voila, music server that doesn't sound like box store crap. Hundreds less, too. Put lossless files on it. Run it with your iPhone.
Don't have a local used audio shop, just a scourge of Wal-Marts? audiogon.com or my local fave, echohifi.com