Gaming PC €900

Hey guys, 

I'm planning on building a PC for about €900, but I can't decide about which processor or GPU I want. The game I really want to run very well on my €900 build is BF4. I really like the NZXT Phantom 410 (pretty cheap but awesome looking case). An OS has to be included.

Thanks in advance.

 

Anything above an amd fx 6300 or and intel i5 3570k as far as the cpu and anything above a 7870 or a gtx 660 will be fine for battlefield and some games in the near future too.