To expand on #4 in this idea, http://forums.autodesk.com/t5/autocad-civil-3d-ideas/better-styles-and-template-management/idi-p/585...
The purgestyles command could really use a button that will set all default/current styles to the Standard style and create the Standard style if it is not in the file.
The command also needs to purge description key sets.
With these improvements and the purge command I can really clean out a file easily... Now aht if the purgestyles command also had a checkbox to purge layers, text styles, linetypes, etc.. merge the purge. 🙂