I have never found the scanner to matter too much when it comes to OCR. All the OCR "quality" was in the OCR software.
And given the error rate even on a good scan still results in 1 or 2 errors per page I find folk that blow up when they discover that.
But that's not why I wrote "Ouch." It's that requirement for searching. I wonder if you are expecting the OCR system to do this for you? If so there is only one company I've seen with such automation (Kodak) yet you see folk blow up again at the costs.
I have been researching the scanner market for a multi-page scanner with software that will help me to scan with OCR and make the subject scanned capable of being searched for by date, title, subject or word and I found the following on a Web Page I will not mention. The only problem is that appearance matters to me and I like number 4 and 5 which both have a lower score.
1. Canon C125 £380.00. SCORE 9.7
2. Fujitsu ScanSnap S1500 £342.00 SCORE 8.9
3. Epson gt s55 scanner £432 SCORE 8.0
4. Canon dr-2020u £460.00 SCORE 7.8
5. Epson Gt-1500 £238.00 SCORE 7.4