OK so here's what I was thinking. Please correct if there's something better cheaper, or if I should focus on other areas (with examples please).
Motherboard $69.99:
GIGABYTE GA-945P-S3 LGA 775 Intel 945P ATX Intel Motherboard - Retail
http://www.newegg.com/Product/...x?Item=N82E16813128015
CPU $139.00:
Intel Core 2 Duo E4400 Allendale 2.0GHz 2M shared L2 Cache LGA 775 Processor - Retail
http://www.newegg.com/Product/...x?Item=N82E16819115014
RAM $189.99-$20MIR=$169.99:
Patriot 4GB(2 x 2GB) 240-Pin DDR2 SDRAM DDR2 667 (PC2 5300) Dual Channel Kit Desktop Memory - Retail
http://www.newegg.com/Product/...x?Item=N82E16820220230
PSU $69.99:
Antec SmartPower 2.0 SP-500 ATX12V 500W Power Supply 115/230 V TUV, UL, CUL, CE, CB, FCC - Retail
http://www.newegg.com/Product/...x?Item=N82E16817103937
Case $139.99-$40MIR=$99.99:
Antec Nine Hundred Black Steel ATX Mid Tower Computer Case - Retail
http://www.newegg.com/Product/...x?Item=N82E16811129021
HDD $69.99:
Seagate Barracuda 7200.10 (Perpendicular Recording) ST3250620AS 250GB 7200 RPM 16MB Cache SATA 3.0Gb/s Hard Drive - OEM
http://www.newegg.com/Product/...x?Item=N82E16822148144
LCD $189.99-$20MIR=$169.99:
ViewSonic Optiquest Series Q20WB Black 20" 5ms DVI Widescreen LCD Monitor 300 cd/m2 1000:1 - Retail
http://www.newegg.com/Product/...x?Item=N82E16824116075
Graphics card $99.99-$15MIR=$84.99:
EVGA 256-P2-N615-TX GeForce 7600GT 256MB 128-bit GDDR3 PCI Express x16 Video Card - Retail
http://www.newegg.com/Product/...x?Item=N82E16814130062
Speakers $38.99
Logitech X-230 32 watts RMS 2.1 Black Speaker System - OEM
http://www.newegg.com/Product/...x?Item=N82E16836121123
Mouse $45.99-$7.50MIR=$38.49
Logitech G5 2-Tone 6 Buttons 1 x Wheel USB Wired Laser Mouse - Retail
http://www.newegg.com/Product/...x?Item=N82E16826104191
Keyboard $12.99
Microsoft Comfort Curve Black 105 Normal Keys 9 Function Keys USB Wired Ergonomics Keyboard 2000 - Retail
http://www.newegg.com/Product/...x?Item=N82E16823109149
Total: $1066.90-$102.50MIR=$964.40
Motherboard $69.99:
GIGABYTE GA-945P-S3 LGA 775 Intel 945P ATX Intel Motherboard - Retail
http://www.newegg.com/Product/...x?Item=N82E16813128015
CPU $139.00:
Intel Core 2 Duo E4400 Allendale 2.0GHz 2M shared L2 Cache LGA 775 Processor - Retail
http://www.newegg.com/Product/...x?Item=N82E16819115014
RAM $189.99-$20MIR=$169.99:
Patriot 4GB(2 x 2GB) 240-Pin DDR2 SDRAM DDR2 667 (PC2 5300) Dual Channel Kit Desktop Memory - Retail
http://www.newegg.com/Product/...x?Item=N82E16820220230
PSU $69.99:
Antec SmartPower 2.0 SP-500 ATX12V 500W Power Supply 115/230 V TUV, UL, CUL, CE, CB, FCC - Retail
http://www.newegg.com/Product/...x?Item=N82E16817103937
Case $139.99-$40MIR=$99.99:
Antec Nine Hundred Black Steel ATX Mid Tower Computer Case - Retail
http://www.newegg.com/Product/...x?Item=N82E16811129021
HDD $69.99:
Seagate Barracuda 7200.10 (Perpendicular Recording) ST3250620AS 250GB 7200 RPM 16MB Cache SATA 3.0Gb/s Hard Drive - OEM
http://www.newegg.com/Product/...x?Item=N82E16822148144
LCD $189.99-$20MIR=$169.99:
ViewSonic Optiquest Series Q20WB Black 20" 5ms DVI Widescreen LCD Monitor 300 cd/m2 1000:1 - Retail
http://www.newegg.com/Product/...x?Item=N82E16824116075
Graphics card $99.99-$15MIR=$84.99:
EVGA 256-P2-N615-TX GeForce 7600GT 256MB 128-bit GDDR3 PCI Express x16 Video Card - Retail
http://www.newegg.com/Product/...x?Item=N82E16814130062
Speakers $38.99
Logitech X-230 32 watts RMS 2.1 Black Speaker System - OEM
http://www.newegg.com/Product/...x?Item=N82E16836121123
Mouse $45.99-$7.50MIR=$38.49
Logitech G5 2-Tone 6 Buttons 1 x Wheel USB Wired Laser Mouse - Retail
http://www.newegg.com/Product/...x?Item=N82E16826104191
Keyboard $12.99
Microsoft Comfort Curve Black 105 Normal Keys 9 Function Keys USB Wired Ergonomics Keyboard 2000 - Retail
http://www.newegg.com/Product/...x?Item=N82E16823109149
Total: $1066.90-$102.50MIR=$964.40