Decide my next upgrade!

[Lituk01]

I want to buy an upgrade for my computer but I'm not exactly sure if anything is bottle-necking another part currently.

My Specs:
Case: NZXT Phantom 410 (White and Black)

CPU: Intel I5 4690k @ 4.3GHz (OC)

CPU Cooler: Cooler Master Hyper 212 Evo

GPU: AMD Radeon R9 270 Asus OC Edition

PSU: EVGA 500w B1 80+ BRONZE

Motherboard: Asus Z97-A

Ram: 8GB HyperX Fury (2x4GB)

OS: Windows 10 Home Edition

Storage: Samsung 850 Evo 250GB SSD, WD Blue 1TB HDD

Headphones: Sennheiser HD 598 SE

Microphone: Samson Meteor Mic

Keyboard: Razer Blackwidow Tournament Edition

Mouse: Razer DeathAdder 2013 Edition

Mousepad: Razer Goliathus Speed Edition (Medium)

My budget is up to 500 dollars, if the difference is really big though i can spend a bit more but only if it really is worth it. Thank you for the help in advance!

 

[The Paladin]

get 8GB more ram and get a 1070 video card