It's happened: the perfect short, flat black boot has been found.
I've hunted and hunted through my bookmarks to find the blog I saw these on last night, but I can't find it again. I do remember that they credited Jane of Ill Seen, Ill Said with the initial find.
At any rate, here they are: the perfect boots, courtesy of Sigerson Morrison. I will now proceed to stare at them until they magically become $350 cheaper.