Just a comment here I just bought a Dell dimension 8400 case here is a link.
I seen this on Ebay and thought wow why don't I just put one together??? Kind of wishing I had found this site before I bought it, finding out that AMD processors are better for gamming but kind of late now as I have bought a P4 3.4ghz (550) processor then I bought the ram (crucial ballistiz ddr2 4300 533mhz 1G )
What I am saying is that bye the time I get done getting all the stuff needed I would have been better off just buying a new Dell for less money and a Warrantee. I still can't find the actual model # for the Intel motherboard, called Dell up and talked to a guy that could hardly speak English and all he could tell me was its the 925x model...thanks bud I knew that... I wanted specifics.
Well just to end this I just wanted to say save your drives buy a new Atx case there not that expensive and go from there....I am pretty sure I am going to run into some teriable problems when I get everything for a complete system and I dont know dittly about the insides of the computer so I am real new at this also but you got to start somewhere