Of course you should get the MPB. iPad 2 is good for reading, but I doubt most of your books will be available on your iPad.
Now on your MBP you can install Microsoft office 2011, and it has a notepad mode - perfect for classes. And you can do a lot more on your computer than on your iPad 2. (I have both).
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I do need the MBP though as I am about to start Digital DJ'ing again and need the portability and userbility of the MBP. Or even the MBA would be quite nice. As long as it is used as a dedicated DJ machine and not overtasked in other areas.
I love the 15" form factor, but if I had to choose one device for every occasion, I'd go with 13" Air right now.