Q6600 - can overclock past 3.0GHz with stock fan.
4GB DDR2 PC6400
8800GT
Motherboard socket 775 of your choice (Depending on what assorted rubbish you need, firewire, USB, Blah blah blah)
A good 600+ watt PSU.
Tower of your choice
Sata 2 HDD's of your choice.
Random CD/DVD Drive.

Thats it.