I'm thinking of buying the 27 inch iMac, or the 21 inch with an additional screen for a dual screen. And/or 15'' MBP retina or 13'' retina. 15'' definitely seems to have a better screen real estate, but is $1000 more expensive than the 13''. Also 13'' is small enough that you can use it lying down on the bed, while 15'' might be a little bulky for that perhaps? But then having more RAM and i7 can't hurt. You never know if you need that extra RAM or i7. Another thing is that I am not sure if I need the portability even. To me it seems if you are going to be outside for a long time, maybe you can get a Kindle and read. 1. There seems to be not much difference between $1500 and $2500 if you are going to use it for many years, and if you are going to pay it in a 12 month payment plan. 2. You might not even need to sacrifice power for portability that much if you get a Kindle with 3G, and you read a lot. 3. If I move to another country to teach English (which I am thinking of), it would be a headache to take the iMac with me.