Multi-function printers provide more value in a smaller space than separate units, but you probably know that already. Adding automatic document feed to your multi-function printer makes it much more useful as a scanner and copier, which is why I like the Epson WorkForce 600. People won't scan more than a couple of pages if they have to place each page on the scanner.
When you get serious about scanning as a way to reduce retained paper, the Fujutsu ScanSnap S1500 provides great performance as the first step into the world of document management. Don't think of document management as much more than intelligent use and storage of the paper you're trying to avoid, and the process will go much more smoothly.
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