Why don't you just wait until you're ready to purchase, and then start a new thread using the "how to..." sticky here:
http://www.tomshardware.com/forum/353572-31-build-upgrade-advice
I find that when people use that sticky they get really good support. By starting a new thread from there, you will have provided answers to all the questions contributors often have. So they can spend their time making good recommendations just for you, rather than wasting time with asking questions and clarifying things.
That build is wasting a lot of money though.
- unlocked 7700K and cooler on a locked (no overclocking) motherboard
- You should get a 250GB SSD at least unless your budget is entirely fixed
- Sony Vegas Pro prefers AMD GPUs, so you'd be better looking at an RX 580 (or equivalent) from the red team when you purchase.
- Video editing, but getting a quad core? A Ryzen 7 1700 would be a much more potent editing CPU (sacrificing some gaming performance though... but unlikely to matter at all on the mid-range GPU you chose).
- 2x144hz monitors is odd. One makes sense for gaming, but just get a cheaper 60hz display for your second. >60hz is not necessary for a second, non-gaming display.
TL DR: You could do much better right now for your money, so December-ish for sure you'll be able to better again. If you use the sticky above when you're ready to purchase you should get a fantastic build for your $$.