You've said that several times...but it is VERY far from my experiences with the Lyr. I used to own the Lyr for about a year and with tubes that were pretty much worth the Lyr itself. Sorry, but with the HD800s or T1s it was a slow brute that couldn't articulate the nuances of the music. It made the HD800s seem slow and plodding regardless of tubes that I ran with it. The WA22 or LF (that I had on hand) stomped it into the ground it wasn't close. And now that the GS-X MKII stomps on the WA22/LF, I'll let you guess how high I hold the Lyr with the HD800s.
Heck, I found the Schiit Valhalla a much nicer "budget" match for the HD800s.
Please remember it was designed as
an ortho amp for the LCD-2s and HE-6s when they first came out. It was designed around their unique power requirements and all the magic smoke talk only served to blow out my Ed. 8s when I plugged them in with the volume dial set to "0".
(And a few other low impedance cans went too with other owners).
Here's a very useful review between the older GS-X model (and the MKII is that much better) and the Lyr by Asr, pretty spot on IMO:
http://www.head-fi.org/t/580636/mini-review-schiit-lyr
So to sum up my experiences, can the HD800s sound "nice" out of mid-fi amps....sure, but you're leaving a lot of cards on the table in terms of what they can really do and to really get to hear what they're about you'll need to look at your full rig: source, dac, amp, etc....
This is pretty much summarizes my last 3 years with my HD800s and with a lot of different gear.