Intel Core i7 920 2.66GHz 4 x 256KB L2 Cache 8MB L3 Cache LGA 1366 Quad-Core Processor - Retail
http://www.newegg.com/Product/Product.aspx?Item=N82E16819115202 $289.99
GIGABYTE GA-EX58-UD4P LGA 1366 Intel X58 ATX Intel Motherboard - Retail
http://www.newegg.com/Product/Product.aspx?Item=N82E16813128374 $259.99 - $20.00 MIR
G.SKILL 6GB (3 x 2GB) 240-Pin DDR3 SDRAM DDR3 1600 (PC3 12800) Triple Channel Kit Desktop Memory - Retail
http://www.newegg.com/Product/Product.aspx?Item=N82E16820231236 $209.99
Western Digital VelociRaptor WD3000HLFS 300GB 10000 RPM 16MB Cache SATA 3.0Gb/s Hard Drive - OEM
http://www.newegg.com/Product/Product.aspx?Item=N82E16822136322 $229.99 - $30.00 MIR
Western Digital Caviar Black WD1001FALS 1TB 7200 RPM 32MB Cache SATA 3.0Gb/s Hard Drive - OEM
http://www.newegg.com/Product/Product.aspx?Item=N82E16822136284 $129.99
SAPPHIRE 100265L Radeon HD 4830 512MB 256-bit GDDR3 PCI Express 2.0 x16 HDCP Ready CrossFire Supported Video Card - Retail
http://www.newegg.com/Product/Product.aspx?Item=N82E16814102803 $99.99
Antec Three Hundred Black Steel ATX Mid Tower Computer Case - Retail
http://www.newegg.com/Product/Product.aspx?Item=N82E16811129042&Tpk=antec%20300 $59.95
CORSAIR CMPSU-550VX 550W ATX12V V2.2 SLI Ready CrossFire Ready 80 PLUS Certified Active PFC Compatible with Core i7 Power Supply - Retail
http://www.newegg.com/Product/Product.aspx?Item=N82E16817139004&Tpk=550vx $89.99 - $20.00 MIR
SAMSUNG 22X DVD Burner Black SATA Model SH-S223F - OEM
http://www.newegg.com/Product/Product.aspx?Item=N82E16827151171 $24.99
Microsoft Windows Vista Home Premium SP1 64-bit for System Builders - OEM
http://www.newegg.com/Product/Product.aspx?Item=N82E16832116488 $99.99
$1,494.86 - $70.00 MIR's
Edit: The GPU is overkill for a non-gaming computer, but CS4 has GPU acceleration for both ATI and Nvidia GPU's.
http://www.tgdaily.com/content/view/39433/140/
The 4830 should provide some nice acceleration for a low price.