Doesn't matter when you buy; it will be outdated within 6 months anyway. If it's out already when you build and at a reasonable price, then go for it.
Only comments I have on that build is if Samsung 840s 250GB goes down to the $100 price range, I'd recommend that over Crucial. But I'm sure either will be fine.
The PSU market swings pretty hard in the US each quarter; you can often get a 700-800W modular platinum for <$120 if you wait for the market to dip. It would also be worth looking at Seasonic and XFX before you buy, as many of their guts (varies model to model) are the same as Corsair's and often priced at ~20% less.
Your graphics card even while idle is going to completely negate the "quietness" of those expensive fans. Not sure if it's worth dumping $60 into them. Microcenter (I live pretty close to one) sells Kingwin fans for $3 a pop and are pretty quiet. They don't push a ton of air through, but if you have watercooling, the only heat in your case is from the GPU. You probably won't know how the sound will all fit together anyway til after you buy it, but just something to consider.
And don't use wifi... buy an ethernet cable! Wifi is so unreliable for gaming. Or I've never had any luck with it in terms of stability for FPS or other pvp games.