Congrats on the BDA-2, Peter! I jumped on the first one I saw used on A'gon -- $1850.
I haven't had too much of a chance to listen, due to the usual suspects (work, children, travel), so I'm holding off on posting any detailed listening observations. I will say, however, that I've been enjoying the BHA-1/HD800 combination much more with the BDA-2 than with the Grace m903, which is a fine DAC in it's own right. The BDA-2's top end is so detailed but so smooth. It's early, but I can see myself wondering if I really need a tube amp for the HD800 down the road.