you want advanced, and you don't want it to decide anything. set it to like 1200 dpi min. you want it large for the future. i forget all the settings just don't use auto. 300 dpi is a 1 to 1 and it doesn't magnify. i can create a huge poster from one button if i wanted to. however you can't set it at say 6400dpi and scan the whole platen, it will only handle up to 2400dpi. but that's about a 150mp right there. creates an image like 20,000 pix or more across and is over kill.
---Mike Savad
MikeSavad.com