Thanks. For me, I do not intend to do significant amounts of video, or anything serious (e.g. the boom operator type), but more the occasional event. Say I was shooting volleyball and wanted to just pick up the background noise, or candids and dancing at a wedding, same idea.
The problem is not the quality of the background noise (what I hear so far through the D800 is actually OK), but the overriding, loud clacking from the lens is louder than everything else. If that were absent, I would be quite happy the way it is.
The manual focus comment is interesting, need to think about that and experiment. I don't know video, just assumed you let it auto-focus. If it's not auto-focusing this is moot.
PS. I saw the book mike at B&H also, thanks, if you test please post comment how it worked, especially if you have time to compare with the built in with regard to AF noise.