I need a new laptop, and have fallen in love with the rMB's from 2015 and newer. My budget right now doesn't support a new one, so i've had my eyes on the 2015's as they are about half the price. The processors seem to be offered in a 1.1, 1.2, and 1.3. How much of a difference, performance wise, would one realize between the 3? Are all 3 M3's? Trying to determine which one I want, as obviously it affects pricing a bit. I know my usage is going to determine some of it - but really i just want the best performance ROI for my dollar, and certainly dont want to spend ~800 on a machine that won't keep up with me.