Very nice! I was looking at the Valhalla but couldn't justify buying since I already own a Little Dot MKIII. I'm sure the Valhalla is better, just would rather spend my money elsewhere for now. No idea how I ended up with 4 stand-alone amps and 0 stand-alone DACs... I'll likely end up buying either a V-DACII or a Bifrost (w/ USB upgrade).
The headphones are a whole different story. I have yet to find anything over or under the price of the Sennheiser HD600's that my ears agree with. I think I personally prefer the 595's over the 650's.