I Need your opinion. I am looking for a detector that I can use a couple times a year on salt water beach but also use coin shooting or relic hunts. I already own some nice machines but want to add a minelab to the detectors I already have. So here are the machines I'm thinking of ...the explorer series XS -2 -SE or se pro AND then lastly sovereign XS or GT. ALSO what coil should i look for.- I would also like 2 waterproof it sometime. Please tell me your opinion