Hello, everybody.

I bought my computer last November but I'm getting bored and have some cash to burn. For about 250 USD, any opinions on what I should upgrade next? I'm thinking graphics card here, but my pc knowledge is very amateur, at best.

AMD ATHLON(TM)64 3000+
160GB Hard Drive SATA150
Sckt939 MSI K8N NEO4-F nForce4
1024 MB (512MBx2) PC3200 DDR
NVIDIA Geforce 6600 GT 128MB

Thanks for any advice.