New build, will it work?

[TomS]

I'm buying the parts for a mates new build, have done one before but am no expert. Will these parts work together and is there anything you would change without incurring extra overall expense?

AMD Athlon 64 X2 4800+ (2.5GHz) Socket AM2 Energy Efficient L2 1MB (2x512KB) Cache
Gigabyte GA M57SLI-S4 SKT AM2 Nvidia MCP55P PCI-E 8Channel audio ATX
XFX 7900GS XXX 256MB GDDR3 256bit DVI HDTV out PCI-E Graphics Card
Kingston 2GB Kit (2x1GB) DDR2 800MHz/PC2-6400 Memory Non-ecc CL5 Unbuffered 1.8V
Western Digital WD5000AAKS 500GB SATA II 7200RPM 16MB Cache - OEM
Arctic Power 500W PSU With PCI-E SATA, 20+4 ATX12V 8pin +12V Connectors - Retail Boxed
LG GSA-H55NBAL 20x DVD?RW/DL/RAM IDE Black Bare Drive - OEM
Casecom 6630 Black Midi Tower Case With Front Panel USB2.0/Audio - No PSU

Thanks a lot

Tom