Your motherboard and processor are not compatible with one another. You require either a socket 754 motherboard, or a socket 939 motherboard if you plan on using either of those parts. I would recommend going the socket 939 route for performance benefits.
I would also recommend upgrading your RAM to DRR400, DRR333 will slightly bottleneck your system and hold back performance, and will also restrain overclocking if that is something you are interested in.
Finally, scratch that video card. I would recommend a 6600GT, basically the same price as that card, but MUCH better performance in everything. The x600 and x700 that ATi released were absolute garbage, this coming from somone who generally favours ATi over nVidia.
Intel C2D E6320 / AMD Athlon X2 3800+
Gigabyte 965P DS3 / DFI nF4 Ultra-D
2GB OCZ Gold PC2-6400 / 2GB OCZ Gold PC4000
eVGA 8800GTS 320MB / eVGA 6800GS 256MB
150GB Raptor / 74GB Raptor
2x500GB / 320GB
OCZ GameXStreme 850w / OCZ StealthXStream 600w