Need help deciding what to upgrade. (specs inside)

BlueVyper

Distinguished
May 13, 2015
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Basically my question is what would you upgrade out of my current system spec.

CPU: i7 2600K (running @ stock)
GPU: EVGA GTX 970
Mobo: Asus P8P67PRO
Ram: Corsair DDR3 8 Gigs
SSD: Samsung EVO 256GB
HDD: WD Black 1TB
Monitor is a Gateway with a max res of 1920x1080

I mostly game on my PC, but I like to have my options open to play around in all aspects of PC related activity. At the moment I was looking at the 2600k, which of course would lead to a new mobo and I would go up to 16 Gigs of ram. Or I was thinking maybe a new monitor that could hit higher resolutions. 4K would be nice to future proof a bit, but then again I know that future proof does not exist, by the time I have hardware to run the 4K, better cheaper 4K monitors will be out there.

So I'm looking for opinions, I get an opportunity about once a year to make some changes, with a budget of "roughly" 500ish I can probably go a bit higher if need be.