What hardware upgrade?

[Claaken]

What part should I get next? PC is used for gaming and various general utilities.

CPU: AMD (Piledriver) FX-8320 3.50GHz (4.00GHz Turbo) Socket AM3+ 8-Core Processor - Retail - OVERCLOCKED TO 4.0GHz
CPU Cooler: Cooler Master Hyper 212 EVO Quiet CPU Cooler
GPU: Msi GTX770 4gb Twin Frozr
PSU: EVGA Supernova 850 G2 80 Plus Gold
MOBO: Gigabyte GA-970A-DS3P
H.D.D : Western Digital 1TB
RAM: Corsair Vengeance Pro Series DDR3 2x8GB 16GB 2400MHz
CASE: Corsair Obsidian 750D

 

[Gingerbread]

Well depends but generally your next goal should be a new GPU if you want to play the newest, most demanding games at higher details.

 

[geofelt]

For general activity, a ssd for windows is one of the best performance upgrades you can make.

For gaming, much depends on the types of games you play,
Few games are going to use more than 2-3 of your 8 threads.

If you play mostly single player fast action games, a graphics upgrade is your most likely upgrade.
If you play strategy games, sims, and mmo types, then faster core speed is more of a priority.
Do some experimenting:
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To help clarify your CPU/GPU options, run these two tests:

a) Run YOUR games, but lower your resolution and eye candy.
If your FPS increases, it indicates that your cpu is strong enough to drive a better graphics configuration.
If your FPS stays the same, you are likely more cpu limited.

b) Limit your cpu, either by reducing the OC, or, in windows power management, limit the maximum cpu% to something like 70%.
Go to control panel/power options/change plan settings/change advanced power settings/processor power management/maximum processor state/
This will simulate what a lack of cpu power will do.
Conversely what a 30% improvement in core speed might do.

You should also experiment with removing one core. You can do this in the windows msconfig boot advanced options option. You will need to reboot for the change to take effect. Set the number of processors to less than you have.
This will tell you how sensitive your games are to the benefits of many cores.

If your FPS drops significantly, it is an indicator that your cpu is the limiting factor, and a cpu upgrade is in order.

It is possible that both tests are positive, indicating that you have a well balanced system, and both cpu and gpu need to be upgraded to get better gaming FPS.
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What is your budget?