My first build/Upgrade ideas... Looking for suggestions...

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My First Build...
Mobo: Gigabyte Z97X-Gaming G1 WIFI-BK
CPU: Intel 4690
RAM: 16GB Kingston Hyper-X Fury red 1600mhz
HDD: Boot: Samsung EVO 840 250GB
Stroage: Seagate Barracuda 7200 rpm 1TB
PSU: Thermaltake Smart Series SP-1000M
GPU: Gigabyte R9 280x oc
Heatsink: Coolermaster hyper 212 Evo
Case: NZXT Phantom 820
Fans... 5 NZXT Hi pro red Led 140mm fans... 2 NZXT 200m white hi pro fans
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Looking at a new cpu gpu/s
Thinking about watercooling...
CPU
Thinking a 4790k i7
GPU Thinking 2 r9 290X Want to watercool this if going for it...
Watercooling....
Dont care for sealed system as want to do the gpu as well as the cpu
Dont have a clue as to what to do or where to look on this one...

Really open to suggestions as to where to go with this... Mostly gaming
Play many different kinds....
Also love to see somthing on cable management Thx guys+

 

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Also...
Have 4k UHD Samsung 28 inch moniter
Razor Mamba mouse and Blackwidow ultimate 2013....(thinking new one as clicking is getting a little old....) lol