PSU: not much of a fan of OCZ PSU
like this one better http://www.newegg.com/Product/ComboDealDetails.aspx?Ite...
500R black-has a fan controller, white LED fans, cable management is so easy and has a lot of room just as much as a full tower
HX750: is modular, silver rated for better efficiency, and is made by a better brand with great support
670: nothing wrong here you can go lower to a 7850 which can max out most to all current games fairly well and since you are also buying a monitor