Hi there,
I am a ex IBM engineer. Try going to this web site ;-
www.aria.co.uk.
They sell at a good price what they call a barebones system. This is a case, motherboard and memory all pre installed. All you need to do after that is pick a CPUand RAM and plug it in.
Sugest you look at the Asus Vintage V2-P5G965 and scroll down to read the review of a customer, he does know what he is talking about.
Happy Times.
Bill