Interesting Question about Buying or Building

Well I thought I could get a good XPS for cheaper than building and I can but the build has a better case w/ better cooling and a better power supply. So here's the two choices.
Dell XPS 420
Chipset - X38
CPU - Q6600
OS - Vista Home Premium 32-bit (would be upgraded to 64)
RAM - 4GB 800MHz
HD - 500GB 7200RPM SATA
Drives - Dual with blu-ray and DVD double write compatible
Screen - 20in SP2008WFP
Video Card - 512mb Nvidia GeForce 8800GT
Sound Card - 7.1 integrated
Keyboard & Mouse - Bluetooth Dell
Extras - Microsoft Works 8
Price - $2169
Discounts - $500 (standard dell) and 15% (from work)
Final Price - $1418.65
Built System (any better ideas are welcomed)
MoBo - Abit IP-35
CPU - Intel Q6600
Case - Antec 900
RAM - Corsair 4GB
Screen - Acer 20" Widescreen (same refresh and native resoulution as Dell)
HD - Seagate 250GB
CD/DVD - Philips DVD burner 2X
Video Card - EVGA 8800GT Superclocked
Keyboard & Mouse - Logitech Cordless
Sound - Creative 7.1
PSU - Sunbeam 580W
OS - Vista 64-bit
Price - 1460.38 (I haven't figured in the shipping and rebates yet)
Any ideas??
Dell XPS 420
Chipset - X38
CPU - Q6600
OS - Vista Home Premium 32-bit (would be upgraded to 64)
RAM - 4GB 800MHz
HD - 500GB 7200RPM SATA
Drives - Dual with blu-ray and DVD double write compatible
Screen - 20in SP2008WFP
Video Card - 512mb Nvidia GeForce 8800GT
Sound Card - 7.1 integrated
Keyboard & Mouse - Bluetooth Dell
Extras - Microsoft Works 8
Price - $2169
Discounts - $500 (standard dell) and 15% (from work)
Final Price - $1418.65
Built System (any better ideas are welcomed)
MoBo - Abit IP-35
CPU - Intel Q6600
Case - Antec 900
RAM - Corsair 4GB
Screen - Acer 20" Widescreen (same refresh and native resoulution as Dell)
HD - Seagate 250GB
CD/DVD - Philips DVD burner 2X
Video Card - EVGA 8800GT Superclocked
Keyboard & Mouse - Logitech Cordless
Sound - Creative 7.1
PSU - Sunbeam 580W
OS - Vista 64-bit
Price - 1460.38 (I haven't figured in the shipping and rebates yet)
Any ideas??