We're looking for a scanner that can handle anything we throw at it -- crumpled binder paper with loads of "hanging chads", possibly bits of spilled dried-up drinks, etc without breaking. And without requiring lots of retries. Is it possible?
We're willing to pay whatever it costs if there's an auto-feed scanner that won't choke when almost everything we throw at it is pretty messy.
But please, if you make some product model suggestions, include older models -- We would rather purchase a 15-year-old model that has been field-tested for 15 years than a newer model that doesn't have much track record.
Image quality is not important for the purpose of this OP. Reliability and efficiency is.