Overall I'm happy with the decision this cycle to build mini-ITX systems. I think it is remarkable what can be done in such a small area, especially compared to only a few years ago.
This latest build has some good and bad though.
Great choice of video card, because it exhausts its heat. Having had a mobo die in this case, presumably due to heat (although CPU and GPU were well within acceptable ranges), I believe this is a Big Deal. One of the HIS "Black Hole" cards might be another viable choice, but would have given up some graphics muscle; I don't think they're too tall, but...Don, would it have fit?
Bad cooler choice though, because it does nothing for the mobo. I might have used something like a Praeton, or similar low-profile cooler. Overclocking should not be a high priority in this form factor. The way the fan was mounted utterly destroys the elegance of this case. Although it's bigger, I believe a Prodigy would have been a more appropriate choice for this build.
PSU gets a pass, but did you not see the 550W Seasonic? The Corsair is oversized, but at least it is modular, and though built by CWT, unlike the non-modular "CX" units, apparently uses all-Japanese capacitors, which are heat-resistant. Which way did you turn it, fan-out or fan-in? The latter might help mobo cooling some. You may wish to replace the front fan with a higher speed model, controlled by the mobo.
I'd love to win this one, primarily for the case and PSU; but I would not build it as-is, but mix and match, lowering the power and heat.