You may want to also consider an R9700non-pro as well, it's close to the price of an R9600Pro and an FX5600U but gives much more power than both cards. IMO. They are availible out there for about ~$200US ($214 was the last price I saw quoted here).
Just FYI. And yes if it isn't playing Planetside like you want, then that's a PERFECT reason to upgrade. Sorry I doubted you, just wanted to make sure you spent your money (how do they say it in the Indy movies) 'Ww-iIi-zely!'
That's just my two frames worth.
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