I know I might not have come across as positive when talking about the Blackhawk. Well, I'm going to perform the virtual equivalent of eating crow. I changed some power cords in my home office system last night -- Audio Envy Mega 3 PC for the Blackhawk, and Cerious Technology Graphene PC for the Audio Mirror DAC. Well, god damn!!! It's like someone added a rocket booster underneath the Blackhawk. It sounds significantly bigger, heftier, and more lush (in a good way) than before. I can crank it up way above my normal listening levels and it never loses its composure. It's still not at the same level as the Luxman, but has certainly reduced the gap further. Hard to believe how a simple change like swapping a power cord can have such a big impact.
Accordingly, I'm changing my guidance on the Blackhawk from Hold to Buy :)