Your rig is about on par with mine and I have no issues running any new game released. Honestly, it would be almost pointless to upgrade your CPU right now, but maybe a nice GPU upgrade soon. Personally I'm waiting for the geforce 800 series to release and all should be just fine.
Don't believe the hype, this is a tech forum so of course everyone's going to tell you to upgrade. I'm telling you as a game designer with insider info, you will be just fine for another year at least.