I have been quite fortunate to have owned some fantastic amps in the past few years. My personal belief is that the best values relative to performance lie in the bottom tier of the upper end (if that makes sense), and I've done pretty well by exploring the entry-level options from the best makers out there (including Eddie Current, Cavalli, Bryston and others).
At this point, I've settled on the LCD-3 and HD800 as my main "reference" headphones. I've also determined that I'll generally keep a stable of one tube amp and one SS amp. To that end, the BHA-1 isn't going anywhere. It does everything I want a SS amp to do -- mainly drive the LCD-3 to its peak (arguable, I know, but it's the best combo I've heard) and competently drive the HD800 without going too far toward the sterile/dry end of things.
My tube amp at the moment is the Super 7, which is one of the very best value propositions I've found in headphone audio. It has just enough of a stereotypical "tube" sound with the HD800 without actively coloring the reproduction of the music. I've had my fling with overly lush amps, and now I'm interested in the best-of-both-worlds sound that the S7 has to offer. If I had to pick a single amp to pair with the HD800, I'd choose the S7 over the BHA-1, but not by a wide margin. It has just that little extra bit of musicality that comes from a properly implemented tube architecture.
Assuming the BDA-2 represents a significant increase in sound quality over my Grace m903, we'll see if any of the above changes in the weeks and months to come.