This will game quite well and the use of the hyperthreaded i7 will kill in video editing. I gave you enough power to handle an overclock if you want. Choice of case is somewhat arbitrary.
I know that you say you have HDD's and SSD's, for video editing it is good to have two HDD's to handle large data block read/writes and an SSD to handle the program calls. Hope this is what you were looking for.
Update: Just saw that the case is not fully compatible with the X61
PCPartPicker part list:
http://pcpartpicker.com/p/838mbv
Price breakdown by merchant: http://pcpartpicker.com/p/838mbv/by_merchant/
CPU: Intel Core i7-5820K 3.3GHz 6-Core Processor ($374.99 @ SuperBiiz)
CPU Cooler: NZXT Kraken X61 106.1 CFM Liquid CPU Cooler ($125.99 @ SuperBiiz)
Motherboard: ASRock X99 OC Formula EATX LGA2011-3 Motherboard ($279.99 @ SuperBiiz)
Memory: G.Skill Ripjaws V Series 16GB (2 x 8GB) DDR4-3000 Memory ($89.98 @ OutletPC)
Video Card: Asus Radeon R9 390X 8GB Video Card ($394.99 @ Micro Center)
Case: Corsair 500R Black ATX Mid Tower Case ($109.99 @ Newegg)
Power Supply: EVGA 850W 80+ Gold Certified Fully-Modular ATX Power Supply ($109.99 @ Amazon)
Wireless Network Adapter: Gigabyte GC-WB867D-I 802.11a/b/g/n/ac PCI-Express x1 Wi-Fi Adapter ($29.89 @ OutletPC)
Total: $1515.81
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2015-12-31 10:36 EST-0500
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