Suggestions for CMS

[Ned Hanks]

I would like suggestions for a web content managment software.

Initial requirements are:

Manage access to uploaded files: i.e. doc, xls, pdf, jpg, etc
   Restrict who can upload, replace and download files.
   Description and discussion on file (blog).
   History of file changes, who and when uploaded not diffs.

Secondary requirments are:
   Blogs or forums
   RSS feeds
   RSS Aggregator

Thanks
Ned