The specs I am interested in would be that it's capable of a 1200 dpi dual-sided scanning of pages of all sizes, minimum size of preferably 6"x4" but at least a half sheet (8½" x 5½"), and the ADF would hold preferably 50 or more documents at a time.
The reason I want this is because I break down old books a digitize them. I use a heat gun to melt the glue on the binding. Then, I use a guillotine paper cutter to cut off the edges with glue on them, then I put them through the printer to digitize them. So, that's why I need the dual sided scanning from an ADF. The price range I am interested in is under $650. Any suggestions?