Replacing Graphics Card - please help

[ZH871]

Hi - I'm new to the forum (and building PC's!), and was told this is the best place to ask!

My old graphics card was an Nvidia WindForce 970 GTX, and it no longer works so I'm looking to replace it.
I'm looking for something that would be max £300, and would run ArmA 3/CoD MW at decent settings smoothly. Is this doable?

PC Specs:
Gigabyte Technology Co. Z170XP-SLI motherboard
Intel Core i5-6600k @ 3.50GHz CPU
8.00Gb RAM
SuperFlower SF-550F14MP 80 Plus Platinum PSU
x2 DDR4's
Alpenfohn cooler

Many many thanks in advance!
(also looking for people to game with!)

 

[ZH871]

Thank you for your replies. May I ask, what would be the pros to getting the above suggestions, compared to getting a GTX1060-06G for example? (I'm fairly new to all this, apologies!)