Combining taxonomy with dropdown menus AND breadcrumbs

I was wondering if anyone has suggestions for combining taxonomy with
dropdown menus and breadcrumbs. I've tried out a number of modules (taxonomy_menu,
taxonomy_context, tax'o'menu, taxonomy_breadcrumb, and taxonomy_access,
along with nice_menus and pathauto), but nothing seems to quite fit the
combination I was looking for.

I want to be able to:

1. have menus automatically based on taxonomy terms
2. specify a "homepage" for some taxonomy terms, rather than
showing all nodes that are in that taxonomy term (e.g., have a custom
"About Us" page for that taxonomy term)
3. have dropdown menus as the menus

Currently, for example, I have #1 and #3 working, (using taxonomy_menu,
taxonomy_breadcrumb, and nice_menus), but #2 doesn't work: when you
click on the dropdown menu item (e.g., "About Us"), you get the listing
of nodes related to that taxonomy, rather than the custom page I
associated using taxonomy_breadcrumb.

I can do any two of the individual pieces, but haven't found a way yet
to integrate all of them. I wondered if anyone has experience or
suggestions for meeting this combination of requirements. It could
involve some coding (though if it's out-of-the-box, that would obviously
be great).

Thanks for any suggestions,