I've learned to live with externals since it's cheaper (and now much easier) to buy a Western Digital external than it is to upgrade the internal storage in my Macs. I have a 1TB desktop for Time Machine, the 1TB portable, and a 500gb portable that has old schoolwork on it.
This what drives me nuts with the retina models. Having to get used to externals defeats the purpose of having an all-in-one laptop. Good machines, but I still can't stand the pursuit of thin above all else.
/rant off