If you want discrimination and will be in salt water (or wet salt water sand) you're going to want a Minelab CTX (if not diving deeper than 10') The Excalibur (if you are) or a Fisher CZ20/21. PI machines work great in the salt water too, but, they don't have much in discrimination and you'll be spend time digging iron junk. Depending on how iron infested your beach is, that can be most of your time, or, not be a big deal. If money isn't an issue, I'd get the Garrett Infinium LS. If money is an issue, the Tesoro Sand Shark is a bargain and works well. The White's Dual Field is another good choice for something in the middle. Forget the Garrett AT series and the White's MX Sport. They claim to work on salt water beaches, but, they don't work well there. To get them stable, you have to turn the sensitivity way down and lose depth. Not what you want when competing for targets with other hunters. If you will be in fresh water only, the ones I mentioned will work great there too. So will the AT Pro and MX Sport, but, they're still limited to the 10' depth like the CTX. Another consideration is coil size. for large expanses of sand, the biggest coil you can get will aid in coverage. For water use, a small coil is much easier to swing. This might sway your decision on which to get, as many of these units don't have interchange coils.....at least not easily interchangeable. The CTX is easy to swap coils as is the Infinium LS. The rest are hard wired and require disassembly to swap them unless you install a waterproof coil connector (and probably void your warranty)
