I currently have a 2010 13" MPB, which I love. But it's getting slow, and it's high time to upgrade. I don't do a lot of processor intensive activities, but I will get something with 16gb of RAM. Screen size and portability don't really matter to me (I'm happy with the 13" screen). I also don't do any gaming on the computer, so the graphics aren't that important to me. What I'm concerned with is future-proofing. The current 13" have the newer Intel processors, but only the dual core. The current 15" have the older processor, but quad core. Suggestions on which way to go?