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I know you mentioned you are using your scansnap to scan pages and were worried about the amount of time it takes to scan increasing quite a bit with higher resolutions. I thought it might interest you, or others reading, to learn about the benefits of a camera....
At the DIYBookScanner site I linked above you can see how they use cheap inexpensive cameras to simply take a photo of each page. An 8"x10" image (page size) at 300 ppi is 2400x3000 pixels, which is only 7.2 megapixels. A very basic camera can easily meet that requirement. If your page is smaller than 8x10 (or your camera has more megapixels) then you get a higher dpi count - and it doesn't take any longer to snap the picture.
They have systems set up where you can "scan" 1200 -ish pages per hour (about 3 seconds per page) - and it is completely Non-Destructive. They also have free software that takes those images, sorts, preps, and saves as pdf...or allows OCR if you are so inclined.
Hope that helps someone!
Cheers,
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