For a sort of gaming system, i wouldn't be spending on a whole lot on the CPU as games are mostly bound to the graphics card. The card you have chosen a low end hence it won't perform as well in video games unfortunately.
Here are some changes:
CPU: Intel Core i5-4690 - I can assure you this will be more then sufficient for gaming purposes but also it can handle video editing and streaming really well as the Haswell micro-architecture is quite powerful despite it being only an i5.
RAM: G.Skill Ripjaws X 8GB 1866mhz - As NickAu mentioned previously in this thread, a single 8GB stick would be a better setup because it will allow easier expansion in the future if you do decide to go for 16GB of ram.
Graphics card: Sapphire Tri-X OC R9 290 - The graphics card chosen should be able to play modern titles at 1080p with medium to high settings and it has a awesome cooler to keep it cool and quiet.
Power Supply: Seasonic S12G 650W - 650W is more then enough for the system plus it allows for little expansions in the future like adding more hard drives, sound cards etc. Also the power supply is very efficient due to it's gold efficiency rating and high quality components used inside it.
System1: CPU- Intel Core i7-5820K @ 4.4GHz, CPU Cooler- Noctua NH-D14, RAM- G.Skill Ripjaws 16GB Kit(4Gx4) DDR3 2133MHz, SSD/HDD- Samsung 850 EVO 250GB/Western Digital Caviar Black 1TB/Seagate Barracuada 3TB, GPU- 2x EVGA GTX980 Superclocked @1360/MHz1900MHz, Motherboard- Asus X99 Deluxe, Case- Custom Mac G5, PSU- EVGA P2-1000W, Soundcard- Realtek High Definition Audio, OS- Windows 10 Pro 64-Bit
Games: APB: Reloaded, Hours played: 3100+ System2: Late 2011 Macbook Pro 15inch