I've been creating professional templates for Jamroom.net software for the past 3 years, I recently released the ProJam range which offer a huge amount of facilities for music/video/image and community based projects:
High-end ProJam templates, here are some examples:
http://projamlight.oinkba.com http://projamdark.oinkba.com
They are easy to customize from one CSS file and include step by step instructions for branding and installation. You'll require
http://Jamroom.net v3.1 software installed on your server with the minimum requirements which works out at around $200 with unlimited user license.
All templates can be purchased and downloaded instantly:
http://www.oinkba.com
If you need more info contact me "Huw Williams" from the Oinkba site.
Hope this helps.