And yeah, it seems like a lot of the recent "computer build" threads have actually followed this format, and I think it's awesome. Cause we can answer questions in the first response, instead of the first response asking for budget, purpose of computer etc.
How much noise a PSU makes greatly depends on the load.
A 1000Watt PSU with only 70% load is more quiet (and efficient) than a 550Watt PSU at nearly 110% load.
Factor that into your graphs too and your guide is perfect...