Which parts would you recommend?

[Worst_Day]

Hey so I'm kind of stuck here.

I currently have:

Athlon x4 740
r7 260x
f2a88xm-ds2 [fm2]
8gb ram
600W "ace" power supply

Now i want to upgrade this... I was hoping to buy maybe an 880k and a r9 380 and a new psu. However i think this is a bottleneck.

I want to play games such as:

csgo
runescape 07 - this only uses 1 core so that 1 core has to be powerful
the forest
h1z1

and other good looking fps games, i have no intention to max them out at all, just decent frames, 60 fps with med/high.

Which parts would you recommend? my budget is around £300 atm

Thank sin advance

 

[AvidEx]

Basing on this bottlenecking guide chart http://www.tomshardware.com/faq/id-2729891/bottlenecking-guide-chart-2015.html getting an 880k + a 380 wouldn't bottleneck the system.

Also, based on your budget its sufficient to buy the parts that you need for upgrading your current rig.