1. Would go for the the 212 EVO, though it is largely a difference in Idle temps.
Though if you are overclocking to 4.5ghz (which will require added voltage), I would be looking a bit higher end toward something like a Noctua NH-D14 or Corsair H100.
2. 850W is more than enough, 750W is the recommended wattage for dual cards, so your set. The mobo supports dual Crossfire/SLI so thats fine as well.
3. No bottlenecks.
If your getting an SSD, I advise a Samsung 830 over the Crucial M4 or any Intel drives.
Also if the rig if for gaming, there is no need for an i7 or 16GB of RAM. Can downgrade to a 3570k and 8GB.