http://www.partspc.com/ProductDetail...62&ProdID=6613
(micro atx)Core 2 Duo E4300, Abit IP-95 mobo, Stock fan - $156 + free ship
http://www.newegg.com/Product/Produc...82E16820161400
1 GIG Crucial PC2 4200 (PC2 533) - $38.99 + 4.99 shipping
http://www.newegg.com/Product/Produc...82E16811154050
APEX Mini tower case supports Micro/flex atx mobos - $39.99 + $15.99 ship
http://www.newegg.com/Product/Produc...82E16827106070
Liteon Combo drive - $30.99 + $5.84 ship
http://www.newegg.com/Product/Produc...82E16817159066
Coolmax PSU 500w - $39.99 + $7.84
Thinking you have your own OS... and dont need floppy drive.. any other cards, video card...
EDIT : $340.62 so far... and you forgot Video card!
http://www.tigerdirect.com/applicati...782&CatId=1559
BFG 6600GT 128MB PCIE Sli capable - $29.97 (no kid) + Ship ??? (lets say $10)
Now, do you have a monitor?