I want to purchase either the 250 or 350 for a backup for my MXT. I mostly will hunt parks, tot parks, beaches and do coin shooting , jewelry, but probably no gold nuggets and limited relic. Money is not a consideration in this purchase since the detectors are so close in price. Is the 350 a better detector for these purposes? I understand that the 350 has a new chip for expanded iron scale , but the 250 has a larger scale on the coin side. What say you guys that are users of these detectors. An extra one when my buddy comes down for the weekend and the grand children. Thanks, Marty