Regarding soundstage, those Harbeths must be awful, or set up really awfully? The HD800's staging/imaging did not hold a candle to what I had going here in that regard (before selling my Invicta yesterday). Agree with the inner level detail thing though.Also, it probably takes a little while to get used to having the music come from in front of you, rather than behind you (or next to your face).
With the ever-escalating prices of TOTL's, headphones are definitely much less of a value proposition than they once were.However, there are some things great headphones do that I've found even great speakers have a hard time with (speed of Stax, low level detail of the HD800 as examples you pointed out) and there is so much less that goes into setting up a listening session with headphones. You put them on your head and that's it. I daresay headphone listeners spend more time actually listening to music than speaker users. Its just inconvenient most of the time.Just spent the last couple hours listening to speakers though, and it was very experiential and enveloping. Headphones can have a hard time with that as its pumping the music straight into your ears.
Funny you mention that, I was just reading about some Murphys a few days ago.
[size=78%]just slap a few coats of tung oil in the cabs after a bit of sanding and call it good. [/size]