I am working on a personal project that offers a service online. I'd like put this out to the public. I don't want to reinvent the wheel and use an existing template/open source project and add my service specific functionality.

The features I am looking for are:

1. Support for different roles (I need to have an admin role, customer and preferred customer roles)
2. An admin section where admins can manage user accounts, login as with users credentials for providing support
3. Customer pages that are role specific (Ex: Some functionality can be used by preferred customers but not non preferred ones)
4. Preferably a pricing/plans page with payment gateway integration

These are some of the basic pages available in most of service sites online. Is there a MVC 3 (preferably 4) written in C# that I can use as a shell to build upon?

Thanks