[nialusa]

Well I`m afraid its one of those take a chance moments, dont know how much second hand engines go for, as for a rebuild being cheaper, it depends whats up with it, if the crank shaft has snapped then it wouldnt be worth it as pretty much all the internals would be damaged in some way. if its just a case of a snapped/broken piston ring then its gonna cost hardly anything to repair, only your time. If your a confident maechanic then go and take a look for yourself, if not, I`d go with a recon engine and just do a straight forward swap.