asp.net cms

I am looking for a kind of content management system in asp.net which should be flexible enpough to allow me to add categories, sub categories and if required more sub categories under the sub categories section. For example a sub category under a category could be a list of articles or a discussion forum.... The site should also allow polls, newsleter, administartion area where adding a category, sub category is as easy as just making an entry in a web form. I am looking for someone who can provide Suggestions on already existing cms solutions in asp.net which can then be customised to suit my particular needs, and then customise(design the homepage and help with information on how to use that particular package to add my own categories, sub categories etc) that particular package for me. For more details, feel free to ask me.