I have a long time thing about Chieftec. Very solidly built cases but not one you seem to see much of now. Don't know how suitable they are for quiet computing nowadays but there designs 10 years ago were very nice.
Regarding the power usage, you might be right. But I prefer to have a more powerful PSU - as I said, two video cards in the future and a little bit of OC - than to be sorry.
With those specs you'll be using perhaps 180W max DC power with a bit more from the wall after PSU losses(which doesn't count, PSUs are rated on output, not input). You'll still have loads of power left on a 360W PSU even with overclocking and a second card. That would push you to maybe 250W.
Are you going to get a second graphics card? Future proofing never works out as planned. Think about this: Crossfire will only work with a similar card. Within a matter of months there will be another generation of hardware and the existing generation won't drastically drop in price. They will however become more difficult to find in time. As they won't become vastly cheaper it is therefore bad value at that point to get a second card when the next generation will already be so much faster for less power. It therefore only makes sense to go for 2 graphics cards if you do so initially and if you do that, you'd be better off just getting a single more powerful card.
Unless you want some really high number of monitors or are buying the absolute top of the range cards on a money-no-object budget, multiple graphics cards do not make sense.
Also, it the PSU is not used at it's full capacity (but only in it's sweet spot), the noise would be much lower.
The noise difference between a 360W (or 400W for that matter) PSU outputting 180W max (more likely <100W in most use) and a 700W PSU outputting 180W will not be recognisable. It will be more down to how the fan profiles are setup and in this case you can expect high power PSUs to be louder just because the efficiency losses for this sub 25% power level are much higher than the 360W at sub 50% power hence far more cooling effort will be needed on the 700W PSU. You will totally miss the sweet spot which is much higher. If you want to see a sweetspot you need to be running something far lower power.
Buying a 700W PSU would be a waste of money.
Seasonic G-360 - I can't find it where I live (Belgium).
Not sure if you're Flemish or Waloon so sorry if I have the wrong language:http://www.ldlc-pro.be/fiche/PB00136219.html
I'm sure there will be others that carry it also.