I am guessing you are buying with U.S. dollars. Here is some components for you to look at:
Intel Core i7 920 Nehalem processor - $278
http://www.zipzoomfly.com/jsp/Produc...dlist=celebros
GIGABYTE GA-EX58-UD3R Motherboard - $187
http://www.zipzoomfly.com/jsp/Produc...dlist=celebros
Patriot Viper 6GB (3 x 2GB) 240-Pin DDR3 1600 (PC3 12800) Desktop Memory Triple Channel Kit - $94
http://www.newegg.com/Product/Produc...82E16820220365
MICROSOFT Windows Vista Home Premium 64-bit - $99
http://www.zipzoomfly.com/jsp/Produc...tCode=10008484
XFX GX260XADJF GeForce GTX 260 Core Video Card - $180
http://www.newegg.com/Product/Produc...82E16814150361
CORSAIR CMPSU-750TX 750W Power Supply - $120
http://www.newegg.com/Product/Produc...rsair%20TX750W
COOLER MASTER RC-690-KKN1-GP Computer Case - $80
http://www.newegg.com/Product/Produc...82E16811119137
(Buy two hard drives)
(One of these) Western Digital Caviar SE16 WD6400AAKS 640 gigabyte Hard Drive - $70
http://www.newegg.com/Product/Produc...82E16822136218
(One of these) Western Digital Caviar SE16 WD3200AAKS 320 gigabyte Hard Drive - $52
http://www.zipzoomfly.com/jsp/Produc...dlist=celebros
Samsung Black 22x Model SH-S222L DVD Drive - $26
http://www.newegg.com/Product/Produc...82E16827151176
Items missing:
Heatsink and LEDs