Upgrades to excisting PC

[Mclelle]

Looking to upgrade my PC somewhat.

What parts do i swap for best value?

As i see it, i should be able to get a gtx1080 without bottlenecking to much with the cpu? or even a 1080ti? Is the 1070ti something to consider?

Is it Worth also upgrading motherboard,ram and CPU to Intels 8th gen?

Budget is somewhat high but NOT unlimited!  All parts bought around november 2015.

 

PCPartPicker part list / Price breakdown by merchant

CPU: Intel - Core i7-4790K 4.0GHz Quad-Core Processor  ($359.48 @ OutletPC)
CPU Cooler: Noctua - NH-D15 82.5 CFM CPU Cooler  ($89.95 @ Amazon)
Motherboard: Asus - Maximus VII Hero ATX LGA1150 Motherboard
Memory: Corsair - Vengeance LP 16GB (4 x 4GB) DDR3-1600 Memory  ($389.95 @ Newegg Marketplace)
Storage: Samsung - 840 EVO 250GB 2.5" Solid State Drive
Storage: Seagate - Barracuda 2TB 3.5" 7200RPM Internal Hard Drive  ($59.99 @ Amazon)
Video Card: MSI - GeForce GTX 970 4GB Twin Frozr V Video Card
Case: Fractal Design - Define R4 (Black Pearl) ATX Mid Tower Case
Power Supply: EVGA - SuperNOVA G3 750W 80+ Gold Certified Fully-Modular ATX Power Supply  ($85.98 @ Newegg)
Total: $985.35
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2017-12-20 06:02 EST-0500

[iRileyx]

Throw a new gpu in there and it'll be fine.

What do you use the PC for?

[Mclelle]

11 minutes ago, RKRiley said:

Throw a new gpu in there and it'll be fine.

What do you use the PC for?

Atm all i play is World of warcraft ^^

I want to play abit more graphicsheavy games soon. Or atleast be able to.

 

I also like to stream ( don't do it that often but i want to be able to)

What GPU should i get? Will the CPU bottleneck me?