GPU or CPU Upgrade? (Gaming)

[_JC]

What could i upgrade to future proof my gaming computer but under a budget of £200. I'm really stuck between either upgrading my CPU, GPU or both.

GPU: AMD Radeon HD 7700 (Ghz Edition)
CPU: AMD FX 4170 Quad Core Processor

Any feedback would be much appreciated.

-JC

 

[_JC]

As for gaming stronger gpu is more important than cpu.
Best you could get is gtx 670, 760, Radeon HD 7950 or 7970.

Was actually thinking to get a 7870 or a 7870XT. What you think?