Great advice for all.
It's not really great advice, it's an admission of a mistake.
Opting for a 128GB HDD is crazy. 128GB isn't anywhere near enough unless you don't plan to store much on it.
Another mistake people make when buying a new machine is to not upgrade the RAM from 4GB to 8GB. 8GB of RAM really should be the minimum for a machine you are purchasing in 2013.