I know this has probably been discussed, but I wanted to put this out there for any who could give some advice to an amateur. For the person who takes 2-3 trips to the beach each year. What would be the best SALTwater machine for the $? Now I know the usual suspects for the die hard beach goers who do it everyday, but this machine will only get used maybe 10-14 days a year. I am not talking dry sand either because I know most detectors will work in dry sand and the AT PRO is ok on wet sand. But a detector that would work IN saltwater. Is there a cheaper alternative to the Excalibur's, the CZ21's, etc? I'm talking used less than $500...