if you're big on music a Dragonfly USB DAC makes a difference with headphones in this type of price range (I assume your source is PC/phone)
Nope. My source is a powerful JVC RX 6010V stereo receiver, computer runs through it for music, movies, sports, etc.
the computer is still the source in your chain there.
I take it then you don't listen portably, in that case the Dragonfly won't be of use