I'm going to Kauai next month. I am trying to decide which detector to buy: Excalibur, Surf PI, Tiger Shark, or Beachunter ID. I am fairly experienced with a Sov XS on land, so I am leaning toward the Excalibur, except for the price. I know that the salt is going to be a problem, and I understand the PI technology gets good depth, but you dig a lot of trash. Any advice is appreciated, as well as tips on hunting in Hiwaii. Thanks in advance.....