It will all fit just fine. You have an ATX motherboard going into an ATX case, all good.
You have too much power 850W is overkill for even a dual card rig. Considering you wont go above a single, 650W should be more than you will ever need. Also, Kingwin arent a reliable brand, its quality is unknown. Get a 650W from either Corsair, Seasonic, XFX or Silverstone. Make sure its 80+ Bronze or better and preferably modular.
You dont need the Arctic Silver, the 212 EVO comes with some rebranded MX-5 thermal paste. The CPU does come with its own heat-sink with pre-applied thermal paste, but dont use that.
The mobo of Pro should come along with WIFI adapter and router (wifi go), unlock and a decent choice..
well, the PSU is more than enough.. haha,, it is a GOLD rated.. it is one of the high end of the Corsairs's PSU.
the power is good enough.. it is up to you if you want to buy a gold series of psu, but fyi, bronze series actually not a bad choice too.. its up to you..
if you want to use 1920 x 1080, then i recommend u to go to Asus HD7850 DCU II or HD7870 DCU II or Asus GTX570 ... these gpu will provide you the best (max) up to 1200, so 1080 not a problem at all and will serve you as your wish SIR!
There is no need to go to GTX670 at all.. unless you use a very big resolution and multiple resolution.