That post and some others were fine, but the majority were talking how 16GB should be in all phones.
And I also say 32GB should be minimum because soon, 128GB will be in phones. We already have 128GB microSD cards. Content is becoming bigger in size, and the more stuff and more pixels, means more use of storage space.
Anyways, I would get the Moto X+1 in 64GB if they don't offer microSD.