"Our test system is based on a power hungry Core i7 965 / X58 system. This setup is overclocked to 3.75 GHz. Next to that we have energy saving functions disabled for this motherboard and processor (to ensure consistent benchmark results). On average we are using roughly 50 to 100 Watts more than a standard PC due to higher CPU clock settings, water-cooling, additional cold cathode lights etc."
"GeForce GTX 680 - On your average system the card requires you to have a 550 Watt power supply unit.
GeForce GTX 680 SLI - On your average system the cards require you to have a 750 Watt power supply unit as minimum."
This is with a GTX 680, which will be using a little bit more power than your GTX 670. Rest assured that the Corsair AX850 is going to provide you with plenty of power now and in the future if you upgrade.
There are some major products that you are missing.
1) Motherboard- Without it, you can't start up your pc
2) Memory- you also need this to run a pc so you can open programs
3) OS- This you need as well because it is the "format of your pc desktop."
4) Case- This is optional but unless you are a employee that works for a building PC company, you should DEFINITELY have it. It keeps all your parts from being harmed and it looks cooler.
5) Wireless Adapter/Wired Adapter/Sound Card- Each of these is optional. It depends on which type of motherboard you get. Most Motherboards have sound built in so you don't need a sound card. Same for the wired adapter. Wireless adapter is something I would get to be safe; most motherboards don't have a wifi adapter.
6) Monitor/Mouse/Keyboard, I'm not sure if you have another monitor, keyboard, and mouse at home to use, but it would be pretty difficult to use your pc without any of those.
7) Thermal Compound- You need to put this on your CPU before you put your CPU cooler on top of your CPU. Without the compound, your CPU overheats and you need a new one.