Here's a better build for gaming. It has the latest gen cpu, a step up in gpu. a psu thats not way overkill, an ssd added, and a 27inch monitor compared to the 19.5 you had selected. This would be a great gaming build, and came in just a hair under what the other was priced at. http://pcpartpicker.com/p/2izjF
http://pcpartpicker.com/p/2izSk This one is a more powerful build. The i7 and added ram will make for faster video editing, and the gtx 780ti is the fastest single graphics card in the world. This system would tear through any modern game with ease, on ultra, and should last at least 3 or 4 years until you would have to upgrade to keep playing games on their highest settings.