This may be a stupid question (and feel free to say so if it is), but does the Headroom Micro DAC have the diamond buffer in it? Does it make sense for it to? From a brief perusal of a thread or two on Head-Fi, it seems not, but I just wanted to make sure.

No, and that's because there is no output buffer at all. The output stage of the Micro DAC is the AD822 opamp. The rationale is that as it will only ever be connected to very high impedance loads, the opamp does not require a buffer to supply adequate current. The other advantage is of course less stuff in the signal path.

This may be a stupid question (and feel free to say so if it is), but does the Headroom Micro DAC have the diamond buffer in it? Does it make sense for it to? From a brief perusal of a thread or two on Head-Fi, it seems not, but I just wanted to make sure.

No but you have me drooling over the idea. Maybe someday. A couple of other things will probably come first.