Hi,
Based on Omshivaprakash's recommendation, Wikimedians in Kolkata were convinced about using Fujitsu ScanSnap SV600 after trying a demo.
This has been now bought as part of the GLAM for Kolikata Little Magazine Library O Gabeshana Kendra grant
http://wiki.wikimedia.in/Grants/GLAM_for_Kolikata_Little_Magazine_Library_O_...
Thanks Omshivaprakash and everyone who gave their valuable inputs.
Ravi