setting up a wiki - looking for suggestions!

hi... looking for suggestions on the 'best' wiki for an app. i want to be able to: -register/login users -admin the site -multiple admins -various roles/access privs for users -enable groups -create/modify categories -allow users to modify text -allow users to make postings private/group/public -allow external resources to monitor a given group/posting/etc.. -generate reports on wiki functionality/activity for distribution -track ads/generate stats for ads -manage an ad campaign within the wiki -allow for docs/files to be uploaded/downloaded/maintained -potentially tie into a file repository (subversion/etc..) -email users of new content/new users/new groups -allow users to invite new users to a given group -allow users to create/admin the given groups -allow users to group chat (online) with each other -allow users to schedule via calender, and to grant permissions to others to view their calender -allow users to edit/change/modify docs that they have rights/access privs to -member section, allows users to see/search through members database, based on various criteria... -allows users to post resumes... -searchable -runs on apache/linux/perl/php/mysql/postgres -relatively straight-forward to run, doesn't require the ph.d - any ideas/thoughts/etc... thanks -bruce bedouglas@earthlink.net