The OpticBook 3600 seems to be pretty popular as a scanner. For software most use ABBYY Fine.
If I was doing that many books I'd probably look into building one of the holding frame/digital camera setups mentioned in other threads (I'll see if I can find the thread).
EDIT: Here's the stuff I was thinking of...
https://www.mobileread.com/forums/showthread.php?t=13848
http://bkrpr.org/doku.php