I'm looking for a high speed (min 90 ppm) scanner with Automatic Document Feeder feature. Also, the scanner must process high volumes (75,000per day duty cycle)Since we need to scan documents of different sizes, the ADF must adjust accordingly. For eg. If a 3 page document has one sheet in A-4 size and 2others in letter size the feeder should accept in that same order and adjust automatically. Could anyone suggest such a scanner?