If you have been looking at document management in Madison then you are probably trying to figure out how you will capture your documents. If you have been thinking that your copier will be your method of capturing then will it be compatible with the system that you are linking it with? Almost every copier manufacturer offers their own document management. There is Scan Flow Store by Xerox, KyoCapture by Kyocera, DocMP by Lexmark, NetDocuments by HP, DocumentMall by Ricoh, you get the point. Almost all of these are hard to get working with your existing system.
A good document management platform will be able to capture, index, store, and retrieve data in a simple manner. If you have to stick with one brand just to get it all to work correctly then you may not even be looking at the right system to start with.