Ok ok, the R9 series are really un stable right now.. It is recommended you wait till AMDs coolers for them arent the only thing you can get on it.. You're best bet if you wanna keep it AMD is the 78xx series or the 79xx series.. So go 7870 or 7970 bro..
but with that CPU.. get the 7850 or 7870, which are fairly good GPUs bro
The R9 series are really loud, and they get REAL hot, the hotter they get the less they perform, so you wont get your bang for you're buck..
If you dont want the 78xx series or the 79xx series, hit up that NVIDIA, not a bad idea.. for NVIDIA I would suggest a GTX 670 from GIGABYTE http://www.newegg.com/Product/Product.aspx?Item=N82E16814125423
Or a 770 from EVGAhttp://www.newegg.com/Product/Product.aspx?Item=N82E16814130921
If this helped click on the solution button:) cheers
What's great about theses that that you can crossfire or SLI