Digital Signage

I am looking at putting Digital signage into store windows. Currently have in mind 6 locations where we may put screens in. Something that will do over a period of time and can adapt as peoples requirements may grow. Ideally we are looking for an option where we can run several pieces of information on a screen at the same time, ie, Video, stills, Audio, etc, in one section, a section with offers and maybe an RSS news feed along the botto In theory the 1 sildeshow will do in most locations but this may not always be the case. For example if one store was doing a promotion over a certain weekend we would want put something together to promote it. What would be ideal would be a site using wordpress or something equally user friendly for non techy people. A situation where it would be just a matter of uploading slideshows just as easily as utube. Let me know your ideas. Basically the one page will broadcast online for all shops so no huge quotes please