First, get rid of the PSU. It is dangerous. I just responded to someone who lost their GPU and CPU when the power supply failed. A video editing system will place demands on the power supply.
http://www.tomshardware.com/forum/id-2547993/psu-tier-list.html
Keeping your mobo and GPU I was able to come up with the build below. Set up the three HDD's in a Raid5 configuration, it will speed up the process considerably while giving a degree of safety if one fails.
Your mobo is not recommended for overclocking an 8350 so it should be left at stock. But I added an aftermarket CPU cooler to improve cooling as the CPU will be tasked by video editing.
The biggest weakness in this build is the GPU, video editing likes more than 2GB of VRAM. But to get to 6 or 8GB would have meant at least $200 and could not have been fit into a $600 build. I would do this build which gives you the CPU, RAM and storage and then you can save up for a new GPU.
https://pcpartpicker.com/products/video-card/#r=8192,6144&sort=a8&page=1
PCPartPicker part list:
https://pcpartpicker.com/list/36q6yf
Price breakdown by merchant: https://pcpartpicker.com/list/36q6yf/by_merchant/
CPU: AMD FX-8350 4.0GHz 8-Core Processor ($149.99 @ Newegg)
CPU Cooler: Cooler Master Hyper 212 EVO 82.9 CFM Sleeve Bearing CPU Cooler ($27.88 @ OutletPC)
Motherboard: Asus M5A97 LE R2.0 ATX AM3+ Motherboard ($0.00)
Memory: Crucial Ballistix Tactical 16GB (2 x 8GB) DDR3-1866 Memory ($85.35 @ Amazon)
Storage: Crucial MX300 275GB 2.5" Solid State Drive ($89.99 @ B&H)
Storage: Seagate BarraCuda 1TB 3.5" 7200RPM Internal Hard Drive ($48.77 @ OutletPC)
Storage: Seagate BarraCuda 1TB 3.5" 7200RPM Internal Hard Drive ($48.77 @ OutletPC)
Storage: Seagate BarraCuda 1TB 3.5" 7200RPM Internal Hard Drive ($48.77 @ OutletPC)
Video Card: Zotac GeForce GTX 650 Ti 2GB Video Card ($0.00)
Case: NZXT Source 210 (Black) ATX Mid Tower Case ($39.99 @ SuperBiiz)
Power Supply: SeaSonic S12II 520W 80+ Bronze Certified ATX Power Supply ($49.99 @ B&H)
Total: $589.50
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2017-02-01 11:45 EST-0500
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