Allan,
I think that depends on alot, like who would be using it andfor what.
And you say "rebuild potential"- What condition are you starting with?
Parts and time factors have to be considered if you plan on any profit.
Also if you are to be selling it, if there is a market in your area for older stuff. I try to keep the newer complete towers to test them. But selling older stuff is hard when you can get an unbelievable system for under $500. I usually giveaway decent newer and working stuff to people who need it, than to scrap it for the little bit of metals in them. Just let them
know you want the older junk stuff. Or trade off the newer and working stuff for the older junk that makes us happier.
There are ads around here with people looking for cases with
XP registration # decals for $25 each.
Jim