Build and integrate website with Salesforce

California non-profit is seeking proposals for development of a new website that is closely integrated with Salesforce. We are open to recommendations about how this would work; possibilities include a custom Drupal or Joomla site, Salesforce customer portal, or selection of Visualforce pages to handle the features that require integration. Key features include: - Clients enter profile information and make payment. Information is stored in Salesforce contact record and opportunities. - Clients return to update profile information at a later time. (This feature is negotiable depending on complexity/price of implementation) - Clients search select profile information on other clients that is stored in Salesforce - Clients access contact information for other clients ONLY if they are logged in and have submitted payment View detailed mockups at: https://californiafarmlink.mybalsamiq.com/projects/newwebsite/naked/cfl_mockup?key=d35f167a4079ff4a9d824ddafafc9f5c8e8a9ead PLEASE review the mockups first - this is a complex project! If you are interested in working with us on this project, please detail your experience integrating websites with Salesforce. Thank you!