Well, first and foremost you have to ask your self, "What am I going to use this PC for?"
Gaming? Leisure? Advanced computing (CAD, 3d software, development etc)?
My Current build is as follows:'
Q6600 @ 2.4 Ghz (stock)
OCZ Gold DC 2 GB DDR2-800
Gigabyte GA-P35-DS3L rev.2
1TB 7200 RPM 32MB...