I have my own custom PHP framework system, ALREADY built! It includes both Admin and Members areas. The framework is the normal stuff everyone needs, like: register, login, view/edit profile, change password, security pin, add new member, view/edit members, and handles affiliate links (if needed).
Then whatever custom the client needs is added into the system.
My framework is built using MySQLi for security, and protected against XSS and CSRF as well!
If you want a solid, secure, and sexy system... Then please select my bid :)