Car Hire Reservations

I need a reservations system for a small but ambitious car hire company. The client has asked for the following features: He must be able to update the car models, prices and availabilities by himself. The visitor of the site will fill a form with the car model, he will choose the start and end date of reservation from a calendar (like in Expedia) and then the system will show availability of that car or not and calculate the total price and the deposit needed for the given time period. There will be online Credit Card transactions and a bank will be used for that. The bank will offer the script for the transactions and they will give instructions how to connect their system with the reservation system of the client. The reservations system must be able to generate all necessary reports about the completed reservations and the admin of the system will have access to these reports online. An optional feature is that travel agents will have access to the reservations system and they will be able to book cars for their clients. In this case no credit card payments will be required but the system must calculate the commission for the agent and generate the appropriate reports for the site's admin. In every case that a reservation will be made (from visitors or agents) the availability of cars must be updated automatically. English will be used in the beginning but adding more languages must be an option for the future, so having an easy to translate system is a serious advantage. I hope my description has given you a clear idea about what my client needs. I will prefer to work with someone who has done this already and he will have a working system to show to me. The client will also need a small site for his car hire company, so it will be good if you can give me an offer for both. In this case I will need to see your work first, so you should provide me with web addresses of RELEVANT working sites that you have designed.