A few things that trouble me.
First, Incompatible board. You need Z97 for that Core i7 to work out of the box. Besides, the Core i5-4690K is cheaper and no faster for gaming than the Core i7-4790K
Second, You seriously don't need a 40g pot of thermal compound. You're not cooling everything that has a dye, chipset or MOSFET on it are you?
Third, No point in getting the 212 Plus. The 212 EVO is a better version.
Lastly, that's not a great monitor. I generally steer away from Gateway's monitors, due to cheap materials and some odd color effects.
Here is a counter build -
PCPartPicker part list /
Price breakdown by merchant
CPU: Intel Core i5-4690K 3.5GHz Quad-Core Processor ($224.73 @ OutletPC)
CPU Cooler: Cooler Master Hyper 212 EVO 82.9 CFM Sleeve Bearing CPU Cooler ($28.66 @ Amazon)
Thermal Compound: Noctua NT-H1 3.5g Thermal Paste ($5.57 @ NCIX US)
Motherboard: MSI Z97-GAMING 5 ATX LGA1150 Motherboard ($134.99 @ Micro Center)
Memory: G.Skill Sniper Series 8GB (2 x 4GB) DDR3-2133 Memory ($82.98 @ OutletPC)
Storage: Crucial M500 120GB 2.5" Solid State Drive ($69.99 @ NCIX US)
Storage: Seagate Barracuda 2TB 3.5" 7200RPM Internal Hard Drive ($82.98 @ OutletPC)
Video Card: Gigabyte GeForce GTX 980 4GB Video Card ($549.99 @ Amazon)
Case: Fractal Design Define R4 w/Window (Black Pearl) ATX Mid Tower Case ($89.99 @ NCIX US)
Power Supply: EVGA 750W 80+ Bronze Certified Semi-Modular ATX Power Supply ($64.99 @ Amazon)
Optical Drive: Asus DVD-E818AAT/BLK/B/GEN DVD/CD Drive ($18.66 @ NCIX US)
Operating System: Microsoft Windows 8.1 (OEM) (64-bit) ($89.98 @ OutletPC)
Monitor: Asus VX228H 60Hz 21.5" Monitor ($139.99 @ Amazon)
Keyboard: Razer Blackwidow Tournament Edition Wired Gaming Keyboard ($77.17 @ NCIX US)
Mouse: Razer DeathAdder 2013 Wired Optical Mouse ($53.32 @ Amazon)
Total: $1713.99
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2014-09-20 17:55 EDT-0400
Excellent quality power supply, better thermal compound, just as balanced, an SSD and a larger storage drive.
Windows 8.1 is a better bet since you can use the serial key an unlimited amount of times. If you use Windows 7 OEM and install it, it will only recognise the serial number of your motherboard and if you change it, the updates stop.