Since you're willing to unbind them, pretty much any scanner that has a sheet feeder would do you. You may be able to find one that will scan both sides, but if not, you'd have to re-integrate the two sides, which is apt to be tedious.
Abby Fine Reader (sp?) has been recommended for OCR use, it's pricey, but it's got a
lot of features that make it easier to use.
There are a number of threads around the forum that discuss specific scanners and techniques that would probably be helpful to you, as well.
Hope that gets you started, at least.
