A suggestion from the standpoint of a designer whos used a fair few CMS systems, if you want to stand out from the crowd of CMS currently available. What I would love is a system that has a built-in file repository - allowing the user to upload any format files for a download section, and on a similar theme, a basic image gallery that allows image upload and the addition of a description. But most importantly both of these features should be clean output code and easily customisable via CSS tags. So they don't have to look anything special, just have the tags in place so that the layout can be altered.
What I've found is that almost every other gallery/upload system tries to achieve too much and they either add too many extra features you can't easily remove without hacking it, or tie the design up in tables and hardcoded attributes. Not noly that but they are always plugins crowbarred into an existing CMS, meaning the backend system for the user isn't straight forward.
Asking a hell of a lot I know - but I'm just trying to think of a good USP for you.
