You will have to get 8GB of dual channel RAM. Just search you preferred website for 4GB RAM and buy two of them. Kingston, Corsair, Adata, Transcend are all good.
You will also have to get the FX-8320 as the FX-6300 is known to bottleneck the GTX 770.
I will suggest a Sesonic ECO 600W over the Corsair GS 600W as it is cheaper and better. If you have some money you cna get the Seasonic S12II or M12II 620W (Modular or non-Modular).
I will definitely recommend getting you GPU imported as the above as said but beware of customs and shipping charges, they can get more than the difference of the price.
With the saved money you may want to pick up a 64GB SSD.
Also, do you have an OS or would you need one?