ok here is what i put together for you from newegg. comes with 4 250 gig drives so you can raid them together and a 20 inch widescreen monitor for nice editing desktop space. decent speakers and keyboard/mouse combo and pretty fast dual core cpu with 2 gigs ddr800 and 550 watt psu. i would recommend spending an extra 40 bucks though on the psu and getting something around 600 watts and a more reputable brand.
Rosewill R5717-P SL 120mm Fan ATX Mid Tower Computer Case withTool-Free kits - Retail
Model #: R5717-P SL
Item #: N82E16811147057
$29.99
ASUS M2A-VM AM2 AMD 690G Micro ATX AMD Motherboard - Retail
Model #: M2A-VM
Item #: N82E16813131172
$64.99
SAPPHIRE 100216L Radeon HD 3850 256MB 256-bit GDDR3 PCI Express 2.0 HDCP Ready CrossFire Supported Video Card - Retail
Model #: 100216L
Item #: N82E16814102714
$169.99
Rosewill RP550 ATX V1.3/ EPS12V 550W Power Supply - Retail
Model #: RP550
Item #: N82E16817182010
$49.99
AMD Athlon 64 X2 6400+ Windsor 3.2GHz Socket AM2 Dual-Core Processor Model ADX6400CZWOF - Retail
Model #: ADX6400CZWOF
Item #: N82E16819103191
$159.99
A-DATA 2GB (2 x 1GB) 240-Pin DDR2 SDRAM DDR2 800 (PC2 6400) Dual Channel Kit Desktop Memory Model ADQVE1A16K - Retail
Model #: ADQVE1A16K
Item #: N82E16820211066
$44.99
4 x Seagate Barracuda 7200.10 (Perpendicular Recording) ST3250620AS 250GB 7200 RPM SATA 3.0Gb/s Hard Drive - OEM
Model #: ST3250620AS
Item #: N82E16822148144
$259.96
Microsoft FA6-00010 Black USB Wired Ergonomics Keyboard Mouse Included - OEM
Model #: FA6-00010S
Item #: N82E16823109161
$38.99
BenQ FP202W V3 Black 20" 5ms DVI Widescreen LCD Monitor - Retail
Model #: FP202W V3
Item #: N82E16824014146
$199.99
LITE-ON 52X CD Burner Black ATAPI/E-IDE Model DH-52R2P-08 - Retail
Model #: DH-52R2P-08
Item #: N82E16827106084
$18.99
Logitech X-230 32 watts RMS 2.1 Black Speaker System - OEM
Model #: 970123-1403
Item #: N82E16836121123
$38.99
Subtotal: $1,076.86