Components in parentheses are what I'm buying, except the processor. I'm waiting for Conroe.

Processor:
(Intel Core 2 Duo E6600 - $316.00)

Intel Pentium D 930 - $173.00
http://www.newegg.com/Product/Product.asp?Item=N82E16819116238

Intel Pentium D 950 - $323.49
http://www.newegg.com/Product/Product.asp?Item=N82E16819116240

Intel Pentium D 960 - $570.00
http://www.newegg.com/Product/Product.asp?Item=N82E16819116247

AMD Athlon 64 X2 4400+ Windsor 2000MHz HT 2 x 1MB L2 Cache Socket AM2 Processor - Retail - $599.00
http://www.newegg.com/Product/Product.asp?Item=N82E16819103746

Motherboard:
ASUS PSLD2 Deluxe - $154.99
http://www.newegg.com/Product/Product.asp?Item=N82E16813131539

ASUS P5WD2-E Premium Socket T (LGA 775) Intel 975X ATX Intel Motherboard - Retail - $229.99
http://www.newegg.com/Product/Product.asp?Item=N82E16813131589

(ASUS P5W DH DELUXE/WIFI-AP Socket T (LGA 775) Intel 975X ATX Intel Motherboard - Retail - $259.99)
http://www.newegg.com/Product/Product.asp?Item=N82E16813131025

ASUS M2N32-SLI Deluxe Wireless Edition Socket AM2 NVIDIA nForce 590 SLI MCP ATX AMD Motherboard - Retail - $209.99
http://www.newegg.com/Product/Product.asp?Item=N82E16813131011

Case:
ASUS Vento 3600 BLK - $124.99
http://www.newegg.com/Product/Product.asp?Item=N82E16811173008

(Antec Performance I P180 Silver - $124.99)
http://www.newegg.com/Product/Product.asp?Item=N82E16811129154

Graphics Card:
GIGABYTE GV-3D1-7950-RH Geforce 7950GX2 1GB (512MB x2) 512-bit (256-bit x2) GDDR3 PCI Express x16 Dual GPU Video Card - Retail - $559.99
http://www.newegg.com/Product/Product.asp?Item=N82E16814125035

BIOSTAR VN78GTX-D4E Geforce 7800GTX 256MB GDDR3 PCI Express x16 Video Card - Retail - $399.99
http://www.newegg.com/Product/Product.asp?Item=N82E16814141014

(XFX PV-T71G-UDE7 GeForce 7900 GT EXTREME (520MHz) 256MB 256-bit GDDR3 PCI Express x16 Video Card - Retail - $259.99)
http://www.newegg.com/Product/Product.asp?Item=N82E16814150139

Power Supply:
Antec TRUEPOWERII TPII-550 ATX12V 550W Power Supply 115/230 V UL, TUV, CB, FCC CLASS B, CUL - Retail - $89.99
http://www.newegg.com/Product/CustratingReview.asp?Item=N82E16817103931

(Antec SmartPower 2.0 SP-500 ATX12V 500W Power Supply 115/230 V TUV, UL, CUL, CE, CB, FCC - Retail - $69.99)
http://www.newegg.com/Product/Product.asp?Item=N82E16817103937

RAM:
GeIL 2GB (2 x 1GB) 240-Pin DDR2 SDRAM Unbuffered DDR2 667 (PC2 5300) Dual Channel Kit System Memory - Retail - $172.99 (For PSLD2)
http://www.newegg.com/Product/Product.asp?Item=N82E16820144808

(CORSAIR XMS2 2GB (2 x 1GB) 240-Pin DDR2 SDRAM Unbuffered DDR2 800 (PC2 6400) Dual Channel Kit System Memory - Retail - $250.00)
http://www.newegg.com/Product/CustratingReview.asp?Item=N82E16820145034

CORSAIR XMS2 2GB (2 x 1GB) 240-Pin DDR2 SDRAM Unbuffered DDR2 800 (PC2 6400) Dual Channel Kit System Memory - Retail - $219.00 - Never mind, slow CAS latency of 5.
http://www.newegg.com/Product/Product.asp?Item=N82E16820145035
http://www.directron.com/twin2x20486400.html

mushkin eXtreme Performance 2GB (2 x 1GB) 240-Pin DDR2 SDRAM DDR2 667 (PC2 5300) Unbuffered Dual Channel Kit System Memory Model 991512 - Retail - $169.99
http://www.newegg.com/Product/Product.asp?Item=N82E16820146093

Hard Drive:
(Seagate Barracuda 7200.10 ST3320620AS (Perpendicular Recording Technology) 320GB 7200 RPM SATA 3.0Gb/s Hard Drive - OEM - $99.99)
http://www.newegg.com/Product/Product.asp?Item=N82E16822148140

DVD-ROM Drive:
(ASUS Black ATAPI/E-IDE DVD-ROM Drive with DVD-RAM Read support Model DVD-E616A2 BK - Retail - $21.99)
http://www.newegg.com/Product/Product.asp?Item=N82E16827135085
// Why does this suck? Because I've got an external DVD burner. 'Nuff said.

Monitor:
(Viewsonic VP930b - $335.99)
http://www.newegg.com/Product/Product.asp?Item=N82E16824116365

Heatsink:
<Deathblooms> I've got a Zalman 7700-Cu
ZALMAN CNPS7700-CU 120mm 2 Ball Cooling Fan with Copper Heatsink - Retail - $49.99
http://www.newegg.com/Product/Product.asp?Item=N82E16835118115
<Deathblooms> Might want to look into the CNPS 9xxx series.
ZALMAN CNPS9500 LED 92mm 2 Ball Blue LED Light Cooling Fan with Heatsink - Retail - $54.99
http://www.newegg.com/Product/Product.asp?Item=N82E16835118223
<Deathblooms> Indigo, might also consider the Thermaltake "Blue Orb II"
Thermaltake CL-P0257 Blue orb II CPU Cooler for LGA775 & K8 - Retail - $42.99
http://www.newegg.com/Product/Product.asp?Item=N82E16835106069
<Deathblooms> The Big Typhoon is also a good heatsink.
Thermaltake Big Typhoon CL-P0114 120mm Cooling Fan with Heatsink - Retail - $59.99
http://www.newegg.com/Product/Product.asp?Item=N82E16835106061
Thermaltake CL-P0268 92mm CPU Cooling Fan/Heatsink - Retail - $49.99
http://www.newegg.com/Product/Product.asp?Item=N82E16835106075

Thermal Paste:
Arctic Silver 5 Thermal Compound - OEM - $5.99
http://www.newegg.com/Product/Product.asp?Item=N82E16835100007

ATI DVI-2-VGA DVI to VGA adapter for Twin-View video cards - OEM - $3.75
http://www.newegg.com/Product/Product.asp?Item=N82E16814999201