Upgrading computer, any advice

[Chronicle]

Hey,

With PlanetSide 2 being around the corner, I thought it's time I upgrade my current set-up:

System Information
------------------
Operating System: Windows XP Home Edition (5.1, Build 2600) Service Pack 3 (2600.xpsp_sp3_gdr.120504-1619)
Processor: Intel(R) Core(TM)2 CPU 6320 @ 1.86GHz (2 CPUs)
Memory: 2048MB RAM

---------------
Display Devices
---------------
Card name: NVIDIA GeForce 8500 GT
Manufacturer: NVIDIA
Chip type: GeForce 8500 GT
DAC type: Integrated RAMDAC
Display Memory: 1024.0 MB
Current Mode: 1680 x 1050 (32 bit) (60Hz)
Monitor: Plug and Play Monitor
Monitor Max Res: 1600,1200

On the current set-up I struggle playing Call of Duty Black Ops & Bad Company 2, however PlanetSide 1 isn't too bad.

So, on that note, any recommendations? In this day-and-age, what kind of build would I be looking at to get the best performance I can?

Cheers.