I use 10 Staedtler 432 color pens. This way I can use the two sides of the sheet. If I use markers like the stabilo point 88 instead of only doing one side I would buy more dense sheets of paper like 100 grams per square meter or even 120 instead of using 80g/sqr meter.
Automatic feeder scanners like the Fujitsu Snapscan are one of the best investments I ever did. No need for one bit at all and you can even scan books cutting the pages. You can scan at least at 600p full color and at 1200 in black and white.