I recently got given an old packard bell 386 pc ive made use of the ram,hard disk and psu but ive still got the motherboard , a working 5 1/4" floppy disk drive , a bust 3 1/2" floppy drive and varios other bits + bobs
Im not shure about the rest of the stuff, but powersupplies are always nice to have. PC power supplies are especially nice because they have several DC voltage outputs and are well filterd.
At least grab that before you dich the rest of the stusff.