should i get the 21 or 27 inch imac? I'm an english teacher doing graduate work, using 20+ word documents at a time for lesson planning, etc.

I've been using my 13 inch macbook circa 2008 and it's time for a new computer with more power and more screen. I have evernote, word, excel, safari, mail, imovie, and itunes all running at the same time while planning lessons. I usually have 20+ word documents open to cross-check my unit plans and I'd like to start using an iPad in conjunction with the imac. I make videos and podcast lectures for my classes as well. Any advice would be greatly appreciated. Thank you!

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