Gaming PC upgrade for $500

Firing Squad has a break-down of a $500 gaming PC upgrade. Roughly the components are as follows:

ComponentSuggestionPriceSupplierNotes
GPUNVidia GeForce 8800 GT$249.99ZipzoomflyAlternatives: Radeon X1950 Pro
CPUAthlon 64 X2 4000+$75.90ZipzoomflyNewegg has same price for X2 4000+ and X2 4800+, $99.99. Alternative: Intel Core 2 Duo E4300
MotherboardGigabyte GA-MA69GM-S2H$79.99NeweggAMD-690 chipset, micro-ATX. Alternative: MSI K9AG Neo2-Digital (ATX).
MemoryOCZ PC2-6400 Paltinum Revision 2 Dual Channel$79.99Newegg$35 mail-in rebate=$44.99

Since this is an upgrade article, the writers have assumed you already have a case, hard drive, optical drive, mouse, keyboard, monitor and OS.