PJ – Check out Heavy Analytics – http://heavyanalytics.com. It is a plugin that we are developing for this purpose. The purpose of the plugin is to give you actionable information about your WordPress/BuddyPress users. For example, it will help you figure out who the leaders in your community are, who the most active members of your community are, etc.
We will be releasing the public Alpha soon and would love to have you test it out and provide some feedback when it is ready! Just enter your email address into the sidebar of the Heavy Analytics site.