$500 Budget: What to upgrade?

[jinshifu]

Hey guys, I'm just a college kid, interning over the summer, making a little cash.

I don't want to spend most of my earnings remaking my rig, just want to upgrade 1 or 2 parts. I'm not clear about which part to upgrade, as I assume there are bottlenecks, etc, so I'm hoping somebody with more knowledge and expertise could lend me some advice.

And my focus is mostly on gaming.

Here's my current setup:

Mobo: Asus A8n-SLI Deluxe
CPU: AMD Athlon64 4000+ (Clawhammer)
RAM: 2 x 1 GB Corsair 3200
Vid Card: (Sapphire) ATI X850XT
Sound Card: Audigy 2zs
Hard Drive: Seagate 160GB Barracuda, SATA

That should be it I think. Let me know if I left out something. Thanks in advance.

 

[The_Prophecy]

I would say pick up these 3 items:

eVGA Geforce 7900GT KO Superclocked

Zalman VF900

Arctic Silver 5

You may also need a bigger power supply to be able to power the 7900GT, so if your currently supply is 400W or less, pick up this Antec Truepower 480W

Total including the power supply (before taxes and shipping): $406