Here's one high-end workstation build with 2x GTX 1080 in 2-way SLI.
PCPartPicker part list /
Price breakdown by merchant
CPU: Intel Core i7-6800K 3.4GHz 6-Core Processor ($408.48 @ OutletPC)
CPU Cooler: be quiet! Dark Rock Pro 3 67.8 CFM Fluid Dynamic Bearing CPU Cooler ($74.90 @ Newegg Marketplace)
Motherboard: MSI X99A WORKSTATION ATX LGA2011-3 Motherboard ($376.84 @ B&H)
Memory: Corsair Vengeance LPX 32GB (4 x 8GB) DDR4-3000 Memory ($219.99 @ Corsair)
Storage: Samsung 950 PRO 256GB M.2-2280 Solid State Drive ($221.65 @ Newegg Marketplace)
Storage: Hitachi Deskstar NAS 4TB 3.5" 7200RPM Internal Hard Drive ($149.99 @ Adorama)
Video Card: MSI GeForce GTX 1080 8GB Video Card (2-Way SLI) ($598.45 @ Amazon)
Video Card: MSI GeForce GTX 1080 8GB Video Card (2-Way SLI) ($598.45 @ Amazon)
Case: Corsair 760T Black V2 ATX Full Tower Case ($169.99 @ B&H)
Power Supply: SeaSonic PRIME 850W 80+ Titanium Certified Fully-Modular ATX Power Supply ($199.99 @ Newegg)
Total: $3018.73
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2017-02-16 22:08 EST-0500
Few words.
For video editing, you'll do better with more cores and threads than high base clock, so went on and put in i7-6800K with it's 6 cores and 12 threads.
Picked one of the best CPU air coolers that also has good looks.
Further reading:
http://www.tomshardware.com/reviews/best-cpu-coolers,4181.html
For i7-6800K, put in matching MoBo in form of X99 chipset EATX MoBo that among other things, supports 4-way SLI and it has 8 RAM slots.
specs:
https://www.msi.com/Motherboard/X99A-WORKSTATION.html#hero-overview
Put in 4x 8GB (total of 32GB) DDR4 quad channel RAM, that you can run at speeds up to 3000 Mhz. RAM is normal profile and won't give you any RAM clearance issues when using Be Quiet! Dark Rock Pro 3 CPU cooler. With this set, you're left with 4 free RAM slots for another 4x 8GB RAM set when you need to double your RAM amount.
For OS drive, put in ultra fast M.2 NVMe SSD.
Further reading:
http://www.tomshardware.com/reviews/best-ssds,3891.html
And for data storage, very reliable HGST (Hitachi) 4TB HDD.
Further reading: https://www.backblaze.com/blog/hard-drive-reliability-stats-q1-2016/
Now, about the main power of your PC. Put in 2x GTX 1080 GPUs that you can run in a 2-way SLI to give your PC the power it needs in video rendering.
Further reading:
http://www.tomshardware.com/reviews/best-gpus,4380.html
Picked one of the best full-tower ATX cases for your PC.
specs:
http://www.corsair.com/en/graphite-series-760t-full-tower-windowed-case
video review:
https://www.youtube.com/watch?v=fLOt8h8-kNY
(Same case is also used in my Skylake build, full specs in my sig.)
And lastly, your system's power plant comes directly from the best PSU OEM, Seasonic. 80+ Titanium, fully modular, 10 years of warranty are just the few things you get with Seasonic PRIME 850 (SSR-850TD). Picked PSU is also the best 850W PSU money can buy at current date.
specs: https://seasonic.com/product/prime-850-w-titanium/
Further reading:
http://www.tomshardware.com/reviews/best-psus,4229.html
(I also have Seasonic PRIME in my Skylake build but my PSU is 650W.)