It's the fastest gaming rig you can get at your budget. You can overclock that gtx 670 to nearly the same level as a stock gtx 680. I also included an excellent deal for the HX750 power supply. It's on sale at NCIX for $105! It's usually in the $150 price range. This will allow you to upgrade in the future and add a second gtx 670 if needed/wanted. Oh and did I mention that particular PSU is fully modular?
I would also suggest taking your time and researching cases. Pick something you absolutely find appealing and has high airflow and good cable management. I'd even suggest upgrading the corsair 400r to the 500r. Either would be excellent choices.