A buddy has given me the task of seeing if this is possible.
He would like;
CPU
1 - 2 Gb RAM
Mobo
GPU
HDD
Case
PSU
He already has a monitor, keyboard, mouse, optical drives and one external IDE drive.
It's a business machine at the core but there'll be some light gaming (Doom3 was mentioned in passing). It will run XP and will never, ever, ever, have to run Vista.
My first thoughts were second hand, but I've done a few new builds adding over generous parts and I get to £200 without a case, psu or mobo which is why I'm here, asking for help again, because I think it can be done.