First off... I'm pretty new to the audio world, but I have decent ears from music training all my life as well as perfect pitch.
I got a HD600 and Asgard setup along with a E10 dac.
So I ran the HD600's out my computer's onboard, and it sounded super thin with no bass at all. As expected.
Plug it into my e10(which is an dac and Amp), it sounded much better.
But once I plugged it into my Asgard, the sound only got slightly better.
There was more bass and a deeper sound, but I got almost the same effect from turning on the bass boost on the e10.
What I'm saying is, the Asgard wasn't really $200+ better than my e10. The difference in sound to me was pretty minimal.
So I got to thinking. What if say instead of the Hd600 and Asgard, I used the $650 (+$50) for something like a HE-500. Even if I did run it from my e10, wouldn't I get better sound for my money? Of course with the higher headphones, I'll probably need a marginally better amp... but the concept is the same.