Job Site with E-mail screening for registaration.

I am looking to create a job site to advertise graduate careers. The key concept which you must be comfortable doing, is i need a system whereby people can only only sign up and subsequently view the job postings and the site, if they have a specific e-mail address i.e @certainuniversity.com. I would need to be able to add to this list easily enough as and when I need to. (Very similar concept to when face book started.) Once the candidate is in, they must be able to view job listings and the job board must have all the usual capabilities. If you check out [login to view URL], this is the type of thing we wish to create, but with the aforementioned initial screening process. Obviously, everything needs to be set up so as it can be easily updated and a possible pay per click system is on the cards during the early stages. I am aware that job board scripts exist, so what I am looking to do is pay you to purchase the source code that already exists and work with it to create this unique site. Finally, the web site will be minimalistic, we do not want a cluttered job site like so many others, but rather a clean and simple to use concept. If you think you can help, please get in contact, and we can discuss the idea in greater detail. Price is not the most important factor to us, we are looking to produce a high quality website with superb functionality and we are happy to pay for it.