That looks more like it. I was going to suggest an i5 processor but the i7-6700K is only $5 - $50 more expensive than the i5 variants so it's well worth the price.
Another thing is the RAM you've chosen. Why take the slow 2133 when you can get much faster for about the same price?
Same goes for the video card, adding a couple of tenners would give you the much faster 1660.
And the power supply... Although your choice has got quite good reviews and Corsair engineers help design them for Channel Well Technology to build, you can get a known-reliable Seasonic for the same price.
For the hard disks, I'd pay some attention to the 1 TB HDD. Your description didn't tell which version of Seagate it is, but so you know there's a large variety intended for different uses. Obviously you'd want one that is designed for 24/7 heavy use. Someone with more knowledge about the models should chime in and tell which one is the best. I'd also take a 240 GB SSD just in case, they're not that expensive any more.
https://pcpartpicker.com/product/QngzK8/adata-ultimate-su650-240-gb-25-solid-state-drive-asu650ss-240gt-r is at the same price range and they have good reviews.
Here's the parts I picked to modify yours (It's the "T" in the Markup bar right above your build list that gives a list like this):
PCPartPicker part list:
https://pcpartpicker.com/list/PZ9RdXCPU: Intel - Core i7-6700K 4 GHz Quad-Core Processor ($307.89 @ OutletPC)
CPU Cooler: Cooler Master - Hyper 212 EVO 82.9 CFM Sleeve Bearing CPU Cooler ($29.89 @ OutletPC)
Motherboard: Asus - Z170-A ATX LGA1151 Motherboard
Memory: G.Skill - Ripjaws V 16 GB (2 x 8 GB) DDR4-3600 Memory ($96.99 @ Newegg)
Storage: SanDisk - SSD PLUS 120 GB 2.5" Solid State Drive ($27.95 @ Amazon)
Storage: Seagate - Barracuda 1 TB 3.5" 7200RPM Internal Hard Drive ($38.69 @ Amazon)
Video Card: Asus - GeForce GTX 1660 6 GB Phoenix Fan Video Card ($223.98 @ Newegg)
Case: NZXT - S340 (Black) ATX Mid Tower Case
Power Supply: SeaSonic - PRIME Gold 650 W 80+ Gold Certified Fully-Modular ATX Power Supply ($89.99 @ SuperBiiz)
Total: $815.38
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2019-04-11 02:45 EDT-0400