Scheduling Module for RapidWeaver Website

I’m in need of a scheduling app/module for a website I’m starting work on soon. This site is being built in RapidWeaver. We want for someone to come to the site, sign up, and then in their account have the ability to schedule an appointment for a service at one of a number of locations that the client has. Currently when someone schedules at their site they can schedule an appointment nearly anytime they want to and if 15 people wanted to schedule an appointment for 1Feb2009 at 9am at X location, then they could. The client wants the scheduling feature to have only so many slots open for each hour so that the visitor only has a limited range of appointment times to choose from. Also, they want for people to be able to pay for their service online after they’ve scheduled it. A few more features: When someone schedules an appointment, they want the system to generate a code for that appointment, an email w/ the clients name and appointment time and a confirmation that they have paid or will need to pay for the service. They want the folks who register to have a profile page where they can upload a profile pic, fill out general info about themselves, be able to pm other members of the site, and maybe have some kind of integration with other social media outlets like facebook or twitter.