Upgrade everything or better build another system.
THAT'S super helpful. If the OP was building a new rig, he would've asked for build advice.
Johan, your system is nicely balanced - it'll play 2010 games and older pretty well. There are only 7 games or so that came out this year that demand a quad-core to play at decent fps.
I'm not planning on playing any of those except eventually Crysis 2, but I want better fps in my current games, so I'm getting an HD 6870 with my Xmas cash and putting off upgrading to a Phenom II X4. (Our builds are similar)
It really depends what games you want to play. Grab a Phenom if you want to play games like Witcher 2, Deus Ex, and Skyrim at decent settings and fps, or get an HD 6870/GTX 560 if you want to max settings/fps on 2010 or older games.