Employment Website Design [frontend/backend]

In short, I am looking to develop an employment website. This project will consist of the layout, front and backend. The site would require the following attributes: - three matrix segments for employers/candidates/advertisers - a [username/password] interface for employers to post their logo and opportunities [eCommerce enabled - PayPal] - a [username/password] interface for candidates to post text resumes - a [username/password] interface for advertisers to post ads [eCommerce enabled -- PayPal] - two seperate search capabilities. for employers [username/password] to review candidate resumes and the candidates to search employer opportunities Ideally, I would like to utilize LAMP technologies. Linux, Apache, MySQL and PHP as they are widely utilized, extremely portable and the latest flavor of the web. I am interested in detailed responses to my query and would like to recieve more than "Pick me, Pick me" replies. For consideration, I require specific recommendations and methodologies, realistic timeframes and painstaking accuracy when it comes to grammar. At this time, these are the only details I have to offer. You are empowered to make any recommendations you see fit as the most creative and innovative team will be awarded this project. Thank you and good luck. I look forward to receiving a minimum of several realistic and professional replies.