Can you put anything better in this gaming build?

Using current parts and prices, and just tweaking your build:

PCPartPicker part list / Price breakdown by merchant

CPU: Intel - Core i5-7600K 3.8GHz Quad-Core Processor ($229.89 @ OutletPC)
CPU Cooler: CRYORIG - H5 Universal 65.0 CFM CPU Cooler ($46.88 @ OutletPC)
Motherboard: ASRock - Z270 Killer SLI/ac ATX LGA1151 Motherboard ($143.88 @ OutletPC)
Memory: G.Skill - Ripjaws V Series 16GB (2 x 8GB) DDR4-3200 Memory ($119.99 @ Newegg)
Storage: Samsung - 850 EVO-Series 500GB 2.5" Solid State Drive ($169.00 @ B&H)
Storage: Western Digital - Caviar Blue 1TB 3.5" 7200RPM Internal Hard Drive ($48.33 @ OutletPC)
Video Card: Gigabyte - GeForce GTX 1080 8GB Xtreme Gaming Premium Pack Video Card ($524.98 @ Newegg)
Case: NZXT - S340 (Black/Red) ATX Mid Tower Case ($68.89 @ B&H)
Power Supply: SeaSonic - S12G 550W 80+ Gold Certified ATX Power Supply ($61.49 @ OutletPC)
Operating System: Microsoft - Windows 10 Home OEM 64-bit ($87.89 @ OutletPC)
Total: $1501.22
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2017-05-25 16:02 EDT-0400

500GB will fill up fast, especially with games easily taking 50GB each... so added a 1TB HDD.
RAM is RAM is RAM. In this case, faster RAM for less.
Fastest GPU within the pricing of your selected GPU... It will perform better.

If budget allows, perhaps update the PSU for one that is semi or fully modular. It helps keep the case cleaner looking plus helps airflow by not having unused cables in the way.
 


OR you can do both: get a case with great airflow and room, and a PSU that is semi or fully modular, Zero chance of hindering airflow with unused cables, plus the build doesn't look messy. Yeah you can go non-modular, but I'd only recommend it if your budget is tight and going modular would give you a PSU that was a time-bomb.
 

Carnaxus

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For the record, I was mostly just being silly. The Tower 900 is way more than what most people will ever need. I bought one because I love how it looks and how easy it is to fit everything inside, but it's not really something I needed.