This build is targeted for someone who want to do some content creation like rendering high quality video while enjoying some games with peace of mind, not having to encounter stuttering and Bottlenecks during so.
Cpu: in games, While you can achieve the same maximum fps with cheaper i5, you will also encounter a lot of frame drops wich lead to stuttering and very bad animations and experience, on the other hand, the i7-5820K can achieve less frame drop, so more enjoyable gaming experience and better at multitasking.
Motherboard: The MSI x99s SLI PLUS is the best Bang for the buck, it's a solid choice, and it's recommended by Anandtech.
Gpu: Gtx 980 clearly the best choice for a single graphic card solution, Cuda cores should help alot in video rendering, gaming ,and streaming.
Psu: EVGA 850W 80+ Gold , nice score and review by jonnyguru.com, and the best at that Price.
Other Parts i choose are based on the best price to performance ratio and nice reviews.
Sorry for my bad English.
Let me know what you think in the comments. Peace.
Edit: i changed the Corsair CSM 650W 80+ Gold to the EVGA 850W 80+ Gold.