You didn't specify your requirements or the size of the hard disks. IDE is slower, but then you certainly don't have a fast system if it doesn't support SATA. If your system has PCI-X or PCI Express slots, then you could add a SATA controller. Is the additional performance worth the expense?
Yes that would be worth the expense, but I also have 3 other computers I am rebuilding also. Those are more expensive and i wanted the home computer to cost a little less than all the systems.