Newegg.com - GIGABYTE GA-MA790GP-DS4H AM2+/AM2 AMD 790GX HDMI ATX AMD Motherboard - AMD Motherboards - $138.99
Newegg.com - AMD Phenom II X4 940 Deneb 3.0GHz 4 x 512KB L2 Cache 6MB L3 Cache Socket AM2+ 125W Quad-Core Black Edition Processor - Processors - Desktops - $229.00
Newegg.com - OCZ Vista Upgrade 4GB (2 x 2GB) 240-Pin DDR2 SDRAM DDR2 800 (PC2 6400) Dual Channel Kit Desktop Memory - Desktop Memory - $48.99
Newegg.com - HIS Hightech H485FN512P Radeon HD 4850 512MB 256-bit GDDR3 PCI Express 2.0 x16 HDCP Ready CrossFire Supported Video Card - Desktop Graphics / Video Cards - $139.99
Newegg.com - PC Power & Cooling S61EPS 610W Continuous @ 40°C EPS12V SLI Certified CrossFire Ready 80 PLUS Certified Active PFC Power Supply - Power Supplies - $99.99
Newegg.com - Western Digital Caviar SE WD2500AAJS 250GB 7200 RPM 8MB Cache SATA 3.0Gb/s Hard Drive - Internal Hard Drives - $47.99
Newegg.com - Microsoft Windows Vista Home Basic SP1 64-bit for System Builders - Operating Systems (Can change this to Home Premium) - $89.99
You will have to reuse some of the parts in your build, but I think it's well worth it, unless you want to have 2 computers, or something. Since you do get the new Deneb 940, you shouldn't need to worry about speeds. You may be able to downgrade a few things to save some money.
Newegg.com - AMD Phenom II X4 940 Deneb 3.0GHz 4 x 512KB L2 Cache 6MB L3 Cache Socket AM2+ 125W Quad-Core Black Edition Processor - Processors - Desktops - $229.00
Newegg.com - OCZ Vista Upgrade 4GB (2 x 2GB) 240-Pin DDR2 SDRAM DDR2 800 (PC2 6400) Dual Channel Kit Desktop Memory - Desktop Memory - $48.99
Newegg.com - HIS Hightech H485FN512P Radeon HD 4850 512MB 256-bit GDDR3 PCI Express 2.0 x16 HDCP Ready CrossFire Supported Video Card - Desktop Graphics / Video Cards - $139.99
Newegg.com - PC Power & Cooling S61EPS 610W Continuous @ 40°C EPS12V SLI Certified CrossFire Ready 80 PLUS Certified Active PFC Power Supply - Power Supplies - $99.99
Newegg.com - Western Digital Caviar SE WD2500AAJS 250GB 7200 RPM 8MB Cache SATA 3.0Gb/s Hard Drive - Internal Hard Drives - $47.99
Newegg.com - Microsoft Windows Vista Home Basic SP1 64-bit for System Builders - Operating Systems (Can change this to Home Premium) - $89.99
You will have to reuse some of the parts in your build, but I think it's well worth it, unless you want to have 2 computers, or something. Since you do get the new Deneb 940, you shouldn't need to worry about speeds. You may be able to downgrade a few things to save some money.