How many documents do you plan on saving? I work at a major international company. We use Kodak hardware to store thousands of documents daily. We have custom scripts that take a scanned document, convert it to a tiff level 4 file and then store it. We uses Access for small tables (i.e. State abbreviates, vendor #'s, etc) snd SQL 7 to store everything else (actually anything you can think of).
Other major vendors include FileNet, but you are talking really big bucks there...