If performance is the most important thing on your list then you should go with intel.

If you do choose amd don't pick a motherboard with an old nforcechipset, a passive ninja won't provide enough airflow for the northbridge which will become really hot.

Interesting indeed, AC isn't famous for the lowest noise levels but the design might have some benefits if there is nothing between the fan and the heatsinks.

I also used tape because of those limitied ties, one really nice improvement though for future p18x series would be a deeper channel for the main atxcabel.

However, the main power cable is to big to fit in running at the back of the motherboard plate so you'll have to use some force to close the door on the back of the chassi.

I think it's a ok build, with a little cable management it would be much better.