I have a chance to get a really nice condition used " Eldorado" even though I was planning to pick up a Vaquero? Why would I buy one over the other??? Which of these two would be the better unit.....price is not an issue! The present owner of the Eldorado says, that it's better in iron infested areas, this appeals to me but is it true? Any ideas on this two detector choice ....dilemma? Thanks.