Exactly.
My point was that you get good reasonable power into the HE-6s and they hit their stride, the HD800s, you'll need a $2700 GS-X, $3500 WA5, etc.... for them to fully hit their stride. The $200 NAD I mentioned was used, but for about a $500 brand new Class A speaker amp, the HE-6's nut get cracked pretty thoroughly IME.
Here is the beast I heard them at my brother's place:
http://www.mcintoshlabs.com/us/Products/pages/ProductDetails.aspx?CatId=amplifiers&ProductId=MC302
Let me tell you, this is on amazing amplifier and was amazing with the HE-6s. Had to be VERY careful to not blow the drivers and the volume dial never made it past 9 o'clock. But that said, a $400 NAD I had access too (C326BEE) wasn't too far off. Much more different than the Schiit Lyr and GS-X with the HD800s!
So I'm going to half to go with what I've heard.