Cool, I got an Asgard 1 for $140 on ebay and I think the Mad Dogs might be my next buy...we'll see though. That will probably only happen if I get tired of the HD650.
Yes it would be, the Matrix M Stage is another good one, but sadly the Asgard pushes about 2x as much power as the Matrix M Stage [no fair Schiit did their home work xD] Still I paid $215 for my Matrix and you know what, it can still push about 100mw into a 600 ohm load, which is a touch louder than I even need to listen to honestly.
That being said, the Asgard shoves a freaking WATT into 60ohms [1000mW] so for the Mad Dog is should do wonders, that said seeing as both are about the same price... it really comes down to sonic prefrance. The Matrix is know to pair REALLY well with the Mad Dog [sadly I got my matrix after my Mad Dog was returned :(
Still I would say yes the Asgard 2 would be a good match for it, at least technically.