Hmmm...lots of replies but none on the Corda Aria. Thus, I'm putting my vote in for the Corda Aria. However, I haven't head lots of other amps except the PA2V2 and of course, the Aria blows the PA2V2 out of the water. However, how good is the Aria against say like a M3 or a PPA, I have no idea.
However, that said, I do like the transparency of the HD580 paired with the Aria..
It is SO real that it sounded like guitars are being played right there in the room..