Graphic card help for ultra perfo

Hello

I am looking to buya new graphic card under 800$.

Please help me find the best one for my needs: run games likes cod blackout at ultra min 120 fps

Here are the gcard I found on amazon: 1- 746$ - PNY geforce gtx 1080 8gb xlr8 (boost overclock 1848) - 3 fan

2- 823$ - ASUS geforce gtx 1080 8gb ROG STRIX (boost clock 1835 mhz) - 3 fans

3- 707$ - GTX 1080 GV-N1080G1 GAMING-8GD (mhz not indicated) - 3 fans

Finally do you suggest I updated my processor:

Intel Core i5-4670K Haswell Quad-Core 3.4GHz LGA 1150 84W Desktop Processor Intel HD Graphics BX80646I54670K