Here's my current budget gaming build. Please feel free to comment.
AMD Bulldozer FX-4100 Quad Core Processor 3.6GHZ Socket AM3+ 95W Retail Box - $120
MSI 970A-G45 ATX AM3+ 870 DDR3 2PCI-E16 CrossFire 2PCI-E1 2PCI SATA3 USB3.0 GBLAN Motherboard - $80
Corsair CMZ8GX3M2A1600C9B Vengeance Blue 8GB 2X4GB DDR3-1600 CL9-9-9-24 Dual Channel Memory Kit - $50
XFX Radeon HD 6850 Fansink 775MHZ 1GB 4.0GHZ GDDR5 2XDVI Display Port HDMI PCI-E Video Card w/ FREE Dirt3 Game - $130
XFX 450W Core Edition Single Rail ATX 12V 34A 24PIN ATX Power Supply 80PLUS Bronze - $30
Zalman Z9 Plus ATX Mid Tower Case Black 3X5.25 1X3.5 5X3.5INT No PS W/ Fan Controller & Temp Display - $45
Western Digital Caviar Blue 500GB 16MB Cache 7200RPM 3.5IN SATA Internal Hard Drive OEM - $40
Samsung SH-S243D/BEBE 24X Black DVD Writer SATA OEM -$20
The total cost after rebates is: $515
AMD Bulldozer FX-4100 Quad Core Processor 3.6GHZ Socket AM3+ 95W Retail Box - $120
MSI 970A-G45 ATX AM3+ 870 DDR3 2PCI-E16 CrossFire 2PCI-E1 2PCI SATA3 USB3.0 GBLAN Motherboard - $80
Corsair CMZ8GX3M2A1600C9B Vengeance Blue 8GB 2X4GB DDR3-1600 CL9-9-9-24 Dual Channel Memory Kit - $50
XFX Radeon HD 6850 Fansink 775MHZ 1GB 4.0GHZ GDDR5 2XDVI Display Port HDMI PCI-E Video Card w/ FREE Dirt3 Game - $130
XFX 450W Core Edition Single Rail ATX 12V 34A 24PIN ATX Power Supply 80PLUS Bronze - $30
Zalman Z9 Plus ATX Mid Tower Case Black 3X5.25 1X3.5 5X3.5INT No PS W/ Fan Controller & Temp Display - $45
Western Digital Caviar Blue 500GB 16MB Cache 7200RPM 3.5IN SATA Internal Hard Drive OEM - $40
Samsung SH-S243D/BEBE 24X Black DVD Writer SATA OEM -$20
The total cost after rebates is: $515