upgrades wanted £500 budget

[caremal5]

Hi, I'm looking to upgrade my pc a little bit, mainly the graphics card which is a sapphire radeon hd 7870. I'm also considering a new power supply but don't want to be spending massive amounts on one. My build is the following,

intel core i5 3570k
asus p8z77-v
sapphire radeon hd 7870
silverstone tech strider 400w
8 gb crucial ballistix ram (also hoping to add another 8gb but will depend on how much I have left over from the gpu and power supply)

 

[Compuser10165]

My initial advice remains. Get the parts I suggested and in terms of gpu get an R9 390 or R9 390X.

 

[hatib]

my suggestion 980