Here's a comparison shop for you from newegg. Of course I'm not exactly sure which part number parts they are putting in your system so I guessed, but it looks as though you would have saved about $400 (you probably wouldn't have to pay tax at newegg). $250 on the parts alone.
On the downside you would have had to pay shipping, you would have gotten the parts by the time you will now get a completed system, you would have had to spend 4 or so additional hours building it yourself, and you wouldn't have a place to bring it back to if anything went wrong.
Still, even at that it's a better deal than buying pre-built.
Update Antec Minuet350 Piano Black Steel MicroATX Slim Case Computer Case 350W 80PLUS Certified Power Supply - Retail
Model #:Minuet350
Item #:N82E16811129039
Return Policy:Standard Return Policy
In Stock
$109.99 $109.99
Update EVGA 132-YW-E180-A1 LGA 775 NVIDIA nForce 790i SLI ATX Intel Motherboard - Retail
Model #:132-YW-E180-A1
Item #:N82E16813188031
Return Policy:Standard Return Policy
In Stock
$329.99 $329.99
Update EVGA 512-P3-N873-AR GeForce 9800 GTX+ 512MB 256-bit GDDR3 PCI Express 2.0 x16 HDCP Ready SLI Supported Video Card - Retail
Model #:512-P3-N873-AR
Item #:N82E16814130376
Return Policy:Limited Non-Refundable 30-Day Return Policy
In Stock
Mail-in Rebate
$204.99 -$12.00 Instant $192.99
Update PC Power & Cooling Silencer PPCS750QBL 750W ATX12V / EPS12V SLI NVIDIA SLI Certified (Dual 8800 GTX and below) CrossFire Ready 80 PLUS Certified Active PFC Power Supply - Retail
Model #:PPCS750QBL
Item #:N82E16817703019
Return Policy:Standard Return Policy
In Stock
Mail-in Rebate
$249.99 -$115.00 Instant $134.99
Update Intel Core 2 Duo E8500 Wolfdale 3.16GHz LGA 775 65W Dual-Core Processor Model BX80570E8500 - Retail
Model #:BX80570E8500
Item #:N82E16819115036
Return Policy:Processors (CPUs) Return Policy
In Stock
$189.99 $189.99
Update Kingston HyperX 2GB (2 x 1GB) 240-Pin DDR3 SDRAM DDR3 2000 (PC3 16000) Dual Channel Kit Desktop Memory Model KHX16000D3K2/2GNR - Retail
Model #:KHX16000D3K2/2GNR
Item #:N82E16820104064
Return Policy:Limited Non-Refundable 30-Day Return Policy
In Stock
$149.99 $149.99
Update Western Digital VelociRaptor WD3000GLFS 300GB 10000 RPM SATA 3.0Gb/s Hard Drive - OEM
Model #:WD3000GLFS
Item #:N82E16822136260
Return Policy:Limited 30-Day Return Policy
In Stock
Mail-in Rebate
$269.99 $269.99
Update Seagate Barracuda 7200.10 ST3250410AS 250GB 7200 RPM SATA 3.0Gb/s Hard Drive - OEM
Model #:ST3250410AS
Item #:N82E16822148262
Return Policy:Limited 30-Day Return Policy
In Stock
$54.99 $54.99
Update ASUS 20X DVD±R DVD Burner with LightScribe Black SATA Model DRW-2014L1T - Retail
Model #:DRW-2014L1T
Item #:N82E16827135156
Return Policy:Limited 30-Day Return Policy
In Stock
$35.99 $35.99
Update Microsoft Windows XP Home Edition SP3 English for System Builders 1 Pack CD - OEM
Model #:N09-02215
Item #:N82E16832116511
Return Policy:Software Return Policy
In Stock
$89.99 $89.99
Subtotal: $1,558.90
