Need help deciding what parts i need for a good gaming pc

That's enough, more than that

more than enough. I got mine about 1.5-2 years ago for the same money and it still runs pretty much any game at highest settings.

It depends on what you want, how good the games should run, etc. When you just want to play games smoothly at high settings you don't need so much money. And you could also tell us if you need something more than just the PC, like mouse + keyboard, monitor, OS, etc.

More than enough.

that´s enough to play all the games maxed out.

When you only want a pc for gaming, i rather you to go for a i5 3750k.

For gpu SAPPHIRE TECHNOLOGY Radeon HD 7970 OC Boost, MB GIGABYTE GA-Z77X-D3H, SAMSUNG SSD 840 120GB SATA III

PSU (very important) XFX PRO 650W CORE EDITION