Is this worth the price? Mini Gaming PC help?

[NoLuckNoob]

Budget:$1800-2000
Purpose:Gaming

CPU: Intel Core i7-4790K 4.0GHz Quad-Core Processor ($339.99 @ Newegg)
CPU Cooler: ??? (need the best)
Motherboard: Asus z97i ($154.98 @ Newegg)
Memory: G.Skill Sniper Series 16GB (2 x 8GB) DDR3-1866 Memory ($153.00 @ Newegg)
HDD: Western Digital RE3 1TB 3.5" 7200RPM Internal Hard Drive ($45.00 @ Amazon)
GPU: EVGA 04G-2983-KR GeForce GTX 980 Superclocked 4GB 256-Bit GDDR5 ACX 2.0 PCI Express 3.0 ($559.99 @ Newegg)
Case: Cooler Master HAF Stacker 915R Mini ITX Tower Case ($56.98 @ Newegg)
-OR-
Case: Xigamatek Nebula ($99.99 @ Newegg)
PSU: ???? Opinions
OS: Microsoft Windows 8.1 (OEM) (64-bit) ($89.98 @ OutletPC)

 

[LordBaymax]

http://pcpartpicker.com/p/bTHpRB
I made some minor adjustments to your build.