Simple Online Catering w/ CMS

Hello Vworkers This is a vague project, that needs to be simple but built around CMS. Website needs to have a simple feel to it, only one page with all items which are added without needing to refresh page (AJAX). Look at the way <[login to view URL]> ordering works very simple. The website will need to have some type of CMS, to add menu section (appetizer, dessert, drinks ect.) and menu items. Please email me your ideas and the cost. I am looking for something cheap for now, which I will later expand if I like the basic idea.