Well, I can't EXACTLY confirm it, but I used to have a P2 266Mhz Dell machine that I was going to upgrade, but after messing with it for a while, I just decided to toss the case... It was useless. And after seeing just how LOW prices are for new cases even WITH a power supply, I just decided to buy a new one.
It of course takes longer to take everything out of the old case and install into the new case, but it was worth it not having to deal with trying to fit stuff into the Dell case. Also that way, everything was nice, clean and organized.
Don't know if that helped you or not... heh