@OP
Just a suggestion(dont shoot me for this
)
You could even go for an
Athlon II X4 635 @ 4k
and get a Sapphire HD6870 @11.4k
Reason:
*media.bestofmicro.com/Y/V/313591/original/amd%20ultra%201920.png
The HD5870 is a lil more powerful than the 6870. So at ultra settings HD 6870 would be min to run at 30fps @1080p
*media.bestofmicro.com/Y/N/313583/original/amd%20high%201920.png
Also the 6870 gives 10fps more than 6850 @high settings