[cd34]

If it is close to what you want, it is about the most complete package out there. Anything else you do would be customizing Drupal or Joomla and using some of their available plugins and writing the bridge modules to do what you need. The advantage to Dolphin is that it contains the geolocation 'searches', their StreamRay product to allow videoconferencing between people, preferred lists, 'hot lists', etc.

If it doesn't do what you need, you're going to have to modify an existing CMS and write modules to handle the unique part. You need to figure out how close it is and the modifications that you would need versus using something that was less developed, but, perhaps more flexible.