Next time, use the BBCode Markup option offered in the same page as the list you've created.
DDR4-3200 is conditional and some CPUs and/or motherboards (especially motherboards that aren't as over-engineered as the top-end ones) may not work properly with it. Given than DDR4-3000 is still much faster than the baseline DDR4-2133, I strongly suggest dropping down to a DDR4-3000 kit, as it's likely it'll produce less hassle, have a very slight performance difference, and saves a little bit of cash.
I really am not feeling the Gigabyte motherboard, though mostly on a firmware basis. If you don't want to deal with Gigabyte firmware but keep a Z170 chipset, this is my choice.
We'll be taking off some cash from the SSD, too. The 850 EVO is a very nice mainstream SSD, but, really, pretty much every modern SSD that doesn't have reliability issues will do very well as a boot/app device. In the real world, they just work nicely. I've personally put in the HyperX Fury, as it should be somewhat cheaper upfront compared to the 850 EVO, and that's what I'm using right now in my desktop.
Also consider the R9 390 equivalents from the AMD aisle. What do you value more, more performance in absolute terms, or more performance per watt/heat dispensed out of the card, into the case, and by proxy, the room? I'll admit, with regard to driver quality, they're now both toss-ups. NVIDIA has never given me any trouble yet, though, and long-term support-wise (OS compatibility), NVIDIA is still supporting cards a decade old. No, really, You can find Windows 10 drivers for their DX10 cards right now.
I have heard
a lot of bad things about the PSU you've picked, at least with regard to this thread. I'm not sure what kind of PSU would best fit your needs in terms of longevity (it seems like power supplies are far more likely to work well late into their lifespans if you're in a 230VAC country, but you're not), Changed it into an RM650x, which should be significantly better in quality and support.
No comment on the monitor (I don't compare them).
That mouse is probably one of the best you can buy. Keep it!
Might as well as "downgrade/upgrade" into a Corsair 200R non-windowed version. I'm not a fan of the look the CM HAF case has... it's a bit... in your face.
PCPartPicker part list /
Price breakdown by merchant
CPU: Intel Core i5-6600K 3.5GHz Quad-Core Processor ($233.99 @ SuperBiiz)
CPU Cooler: CRYORIG H7 49.0 CFM CPU Cooler ($34.50 @ Newegg)
Motherboard: Asus Z170-E ATX LGA1151 Motherboard ($90.99 @ Newegg)
Memory: Corsair Vengeance LPX 16GB (2 x 8GB) DDR4-3000 Memory ($69.88 @ OutletPC)
Storage: Kingston FURY 240GB 2.5" Solid State Drive ($59.99 @ Newegg)
Storage: Western Digital Caviar Blue 1TB 3.5" 7200RPM Internal Hard Drive ($47.99 @ Micro Center)
Video Card: MSI GeForce GTX 970 4GB Twin Frozr V Video Card ($304.99 @ Newegg)
Case: Corsair 200R ATX Mid Tower Case ($44.99 @ Newegg)
Power Supply: Corsair RMx 650W 80+ Gold Certified Fully-Modular ATX Power Supply ($79.99 @ Newegg)
Optical Drive: Asus DRW-24B1ST/BLK/B/AS DVD/CD Writer ($18.89 @ OutletPC)
Monitor: BenQ XL2411Z 144Hz 24.0" Monitor ($269.00 @ Amazon)
Mouse: Logitech G502 Wired Optical Mouse ($49.99 @ Best Buy)
Total: $1285.19
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2016-04-22 10:21 EDT-0400
Here we go! Remember that some things are a matter of taste - change things as you see fit. You can certainly change the case if you prefer something more loud! (Oh, and the budget leeway affords you enough to buy the best cases around.)
Since we have managed to enable a lot of budget leeway by changing components to things that make more sense, do consider if you might benefit from features a more expensive Z170 motherboard might provide, or a 2TB HDD. (I don't think that spending too much on the SSD is worth it if you have auxiliary storage.)