New GPU

So next month i should have around £250 max, and i was thinking of getting a R9 280x! and i was wondering if anyone could suggest anything else or deals, right now i have a 7790 and a A8 3870, but i will be getting a new CPU and motherboard for Christmas.I mainly play Battlefield 4, Skyrim (modded), Arma 3, Chivalry and borderlands 2.

R9 280x is a great card, plays everything on high-max settings with a few exceptions. But for the sake of it, do you have any idea of what other specs this system will have, CPU , MOBO, RAM, etc 

Im not sure on the CPU and Motherboard just yet but something like this http://uk.pcpartpicker.com/p/mgQz

ya that will work fine together