iPhone app: Event Management & Status Updated - No Graphics

iPhone developer required for event management application: - relatively straightforward build requirement - no heavy graphics (think informative website layout) - MySQL database already built (lots of PHP scripting also done - possible to port / still user?) iPhone app will consist of: - ability copy contact information from address book to application - 3 / 4 active menu pages - Push notifications to other users App functionality will include: - User 1 creates a project and sends invites to Users 2,3,4.... (using address book info) - User 2,3,4... receives notification (if registered, email if not) - User 2 updates Project status (1 of 3 options: Yes, No, Preferred) - User 2 confirms updates - User 1 receives notification that status of Users 2,3,4 have been updated - User 1 logins into app and confirms status of other users - Project should also be able to access photos stored on phone / take new photos - Project should also have access to GPS / Google Maps so User 1 is able to define a location - There will be 2 versions of the app: A premium version which allows users to create apps (and be receive invites) and a "lite" edition where users can only receive invites As I mentioned above, the MySQL database structure has been built (we have a PHP web app in developed), we require the front end and iPhone functionality. Please don't hesitate to ask if you need further information. I look forward to hearing from you Jon