Here is a build for around $450 that is pretty nice in my opinion. This does not include mouse/keyboard or monitor or OS. add about $90 to it for and OS.
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Case and PSU:
Rosewill R604TBLK-N 120mm Fan, mesh air filters & Tool-Free kits ATX Mid Tower Computer Case,with 450W Dual Fan Power Supply - Retail
http://www.newegg.com/Product/Product.aspx?Item=N82E16811147030
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Motherboard:
BIOSTAR TFORCE TA790GX A2+ AM2+/AM2 AMD 790GX HDMI ATX AMD Motherboard - Retail
http://www.newegg.com/Product/Product.aspx?Item=N82E16813138128
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CPU:
AMD Athlon 64 X2 7750 2.7GHz Socket AM2+ 95W Dual-Core black edition Processor Model AD775ZWCGHBOX - Retail
http://www.newegg.com/Product/Product.aspx?Item=N82E16819103300
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Memory:
(2 of these ) Kingston HyperX 1GB 240-Pin DDR2 SDRAM DDR2 1066 (PC2 8500) Dual Channel Kit Desktop Memory Model KHX8500D2/1GR - Retail
http://www.newegg.com/Product/Product.aspx?Item=N82E16820104012
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Video Card:
ASUS EAH4670/DI/512M/A Radeon HD 4670 512MB 128-bit GDDR3 PCI Express 2.0 x16 HDCP Ready CrossFire Supported Video Card - Retail
http://www.newegg.com/Product/Product.aspx?Item=N82E16814121274
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Hard Drive:
Western Digital Caviar SE16 WD2500AAKS 250GB 7200 RPM SATA 3.0Gb/s Hard Drive - OEM
http://www.newegg.com/Product/Product.aspx?Item=N82E16822136161
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Total before shipping and tax: $399.94
add all tax and shipping and your price .
___________________________________________________________________________________________
Case and PSU:
Rosewill R604TBLK-N 120mm Fan, mesh air filters & Tool-Free kits ATX Mid Tower Computer Case,with 450W Dual Fan Power Supply - Retail
http://www.newegg.com/Product/Product.aspx?Item=N82E16811147030
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Motherboard:
BIOSTAR TFORCE TA790GX A2+ AM2+/AM2 AMD 790GX HDMI ATX AMD Motherboard - Retail
http://www.newegg.com/Product/Product.aspx?Item=N82E16813138128
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CPU:
AMD Athlon 64 X2 7750 2.7GHz Socket AM2+ 95W Dual-Core black edition Processor Model AD775ZWCGHBOX - Retail
http://www.newegg.com/Product/Product.aspx?Item=N82E16819103300
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Memory:
(2 of these ) Kingston HyperX 1GB 240-Pin DDR2 SDRAM DDR2 1066 (PC2 8500) Dual Channel Kit Desktop Memory Model KHX8500D2/1GR - Retail
http://www.newegg.com/Product/Product.aspx?Item=N82E16820104012
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Video Card:
ASUS EAH4670/DI/512M/A Radeon HD 4670 512MB 128-bit GDDR3 PCI Express 2.0 x16 HDCP Ready CrossFire Supported Video Card - Retail
http://www.newegg.com/Product/Product.aspx?Item=N82E16814121274
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Hard Drive:
Western Digital Caviar SE16 WD2500AAKS 250GB 7200 RPM SATA 3.0Gb/s Hard Drive - OEM
http://www.newegg.com/Product/Product.aspx?Item=N82E16822136161
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Total before shipping and tax: $399.94
add all tax and shipping and your price .