edit: Full public facing dump, archiving everything. I already scrape every page recursively so this just makes it easier on your server with less queries from myself and like 50-60 other archivers that constantly download and update.
This would not stop new image queries however.
Deleted comments would be welcome in the dumps - it would take a lot of effort to stir up shit from a deleted comment pulled from a DB dump, it would also provide better transparency. If not, comment archivers will continue to run most likely resulting in more queries.