new graphics card for BF4

jay2577

Honorable
Hi guys i'm thinking of buying a new graphics card before i buy battlefield 4.
My specs are
AMD-FX 8320 @ stock, 8gb ddr3 1600mhz ram, ocz agility 3 120gb solid state
drive, AMD 7850 2gb, Gigabyte GA970-DS3, Antec 520w pro gamer PSU.

What should i buy? I'm thinking AMD because i am intrigued by mantle and my 7850 has done me well gaming with no crashes or issues whatsoever. I want to play at nearly max settings and an AMD Radeon R9 290 seems pricey to me.
What are you guys using at what settings? Also i may need a new PSU depending on the suggestions so bare that in mind please.
Thanks in advance for any suggestions