Is This a Good Gaming PC Build?

Here, this will save you money and give you about the same gaming performance. I chose the 850W GQ power supply because it has headroom for a second GPU even.

PCPartPicker part list / Price breakdown by merchant

CPU: Intel Core i5-6600K 3.5GHz Quad-Core Processor ($244.99 @ NCIX US)
CPU Cooler: CRYORIG H7 49.0 CFM CPU Cooler ($43.53 @ Amazon)
Motherboard: Asus Z170-A ATX LGA1151 Motherboard ($153.99 @ SuperBiiz)
Memory: G.Skill Ripjaws V Series 16GB (2 x 8GB) DDR4-2400 Memory ($67.99 @ Newegg)
Storage: Samsung 850 EVO-Series 500GB 2.5" Solid State Drive ($147.00 @ Amazon)
Storage: Seagate Barracuda 2TB 3.5" 7200RPM Internal Hard Drive ($72.99 @ Newegg)
Video Card: MSI GeForce GTX 980 Ti 6GB Video Card ($649.99 @ B&H)
Case: Fractal Design Define S w/Window ATX Mid Tower Case ($74.99 @ SuperBiiz)
Power Supply: EVGA 850W 80+ Gold Certified Semi-Modular ATX Power Supply ($94.99 @ NCIX US)
Operating System: Microsoft Windows 10 Home OEM (64-bit) ($87.99 @ Amazon)
Monitor: Acer G257HU smidpx 60Hz 25.0" Monitor ($259.99 @ B&H)
Total: $1889.44
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2016-02-26 08:00 EST-0500