ipad mini or ipad with retina for college

I cannot decide between the ipad mini and the ipad with retina. I am an engineering student and want to carry around an iPad instead of lugging my books plus laptop around. I want to be able to pull it out in class and read my books on it.
Is the mini going to be hard to read my textbooks on? is the ipad 4 going to be too large to pull out in class, is it worth the extra money?
Obviously the 170 dollar price difference is a big deal. I also am not sure if I need the 32gb. I don't plan on using it for much besides school, so no music downloads or movies will be stored on it.

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