which part should i upgrade in the future

KenKraken

Distinguished
Jan 3, 2015
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18,680
CPU: Intel Core i7-4790K 4.0GHz Quad-Core Processor ($329.99 @OutletPC)
CPU Cooler: Noctua NH-D14 6 ($77.73 @ OutletPC)
Motherboard: MSI Z97 gaming 7($179.99 @ Newegg)
Memory: Corsair Vengeance (2x8gb) ($139.99 @ Newegg)
Storage: Samsung 850 120GB ($129.99 @ OutletPC)
Storage: Weatern Digital 2TB black($124.99 @ OutletPC)
Video Card: GeForce MSI GTX 980$559.99 @ Amazon)
Video Card: GeForce MSI GTX 980 (2-Way SLI) ($559.99 @ Amazon)
Power Supply: Cooler Master v850 ($169.99 @ Newegg)
Optical Drive: LG drive($19.29 @ OutletPC)
 
Solution
mostly nothing, a bigger ssd would be nice, or 32gigs for ram, but but both are not a must, if you are fine with what you have. your build is awesome, and you should enjoy it's performance.