iPad or iPad Mini

In September I will be starting college and for sure I know Im getting a macbook air but I am also looking at getting an iPad to help my work flow. But do I go with an iPad or a iPad Mini. Im leaning towards a mini but Im willing to wait for the retina display model. I would use the iPad for editing/annotating, reading, researching.....and do the rest on my macbook.

Any suggestions, should I not get it at all, one better than the other at these tasks?

In advanced I appreciate your responses!