Upgrade CPU or GPU?

[Psychosocial94]

Hello forums,

So with what I feel is an old rig, I'm set on doing a small upgrade to handle the newer generation of games.

Here's my specs:

Gigabyte Z77-D3H Intel Z77 (Socket 1155) DDR3 Motherboard
Intel Core i5-2500K 3.30GHz (Sandybridge) Socket LGA1155 Processor - W/ STOCK COOLER
VTX3D HD 7850 2048MB GDDR5 PCI-Express Graphics Card
Corsair Vengeance Low Profile 8GB (2x4GB) DDR3 PC3-12800C9 1600MHz Dual Channel Kit (CML8GX3M2A1600C9)
Cooler Master Silent Pro Modular 600W '80 Plus Bronze' Power Supply

So my main question is as the title states. Should I upgrade my GPU or my CPU to something that you can recommend? For GPU I was thinking GTX 970 but I wasn't sure if i have enough power with 600W???

 

[Psychosocial94]

Is the Palit 970 a good one? Or does it not really matter?

And my CPU is still only a Sandybridge? Will that not be too much of an old CPU?

 

[Psychosocial94]

My case is a Cooler Master Elite 430 Blue LED Windowed Case - Black

Will it be big enough for the Inno3D and Matterhorn cooler?

 

[Psychosocial94]

Awesome, thanks everyone. I'll put some thought into it then!

I'm liking the sound of the Galax and the Raijintek.