I'd say we don't need to "pretend" all we do is game--I, for example, only game, do some word processing, and web-surf on my PC.
On the actual builds, I have only 2 criticisms: one is that CFX'd 7970s, the most power hungry card,
only uses 650W at load (scroll to the bottom). Even a 750W PSU is safe. Secondly, SLI'd 670s perform as well or only slightly (less than 5%) worse than a 690 for $200-300 less, making the 690 a bad purchase (unless you have severe space restrictions, such as mITX). Otherwise, I say that's a fair assessment of the current PC building landscape.
I'd add that VMs, photo editing, and CAD work can be accomplished by switching to a 3770K (or non-K, for work that must be computationally correct 100% of the time) and dropping $100 out of the GPU. The GPU should also be Nvidia for CAD and photo/video editing (though even the $100 GTX 650 is enough for Photoshop CS6).