OOPS! I should also mention that IF you are going to ghost multiple pc's they should be about 99.99% identical to each other. This means that the cpu's should be the same type and speed, the hard drives about the same size, the BIOS at least from the same manufacturer.
WHY? If your componets are different from pc to pc, then you will NOT be able to ghost each machine. There is supposed to be a way around this, but I haven't seen it work very well. Maybe somone eklse has, but I have not. Good luck!