Advice building a Win7 box

[Iterate]

3. It might seem backward to pick the PS first,

but I was so impressed with the "BeQuiet!" brand and product line that I picked one up while I could, knowing I'd use it soon. I want ten years use out it, at least.

Here's a review of a similar model:
http://www.silentpcreview.com/bequiet_Dark_Power_Pro_10_550W

I chose a smaller model. Again with the wattage thing, picking too large of a PS means that they won't often run at their optimal output. Not sure if they're available for direct order in the US yet. I think anything rated highly on that site is a safe bet, as you can't easily get silence and good energy performance without good design and build.