Treasure Dave and myself have seen increased competition at the local treasure beaches but most of it is from guys and gals with land machines! If you really want the good stuff you need to get in the water.
Theirs lots of treasure out there and its just waiting to be found and if your in the water, that's all the better.
I'll attach a couple of amazon links for the Minelab Excalibur II & I which is what Treasure Dave and I both use and give our highest recommendation.
I also like the Fisher CZ-21 and in my humble opinion these are the ONLY metal detectors to be looking at, both of them work equally as well on land. Fit and finish on the Minelabs/Fishers is top notch and second to none .. These metal detectors will last a LIFETIME with proper preventive maintenance.
They are worth every penny .. Dave and I can prove it!!
I can tell you right now, at least a few of you will go out and buy a different metal detector .. you will be sorry. I've had my Fisher for just about twenty YEARS and it's never had a hick-up .. only downside was that the Fisher ate nine volt batteries like candy, but that was it.
If you plan on using the metal detectors in the water only, stick to the ten inch coil but if your going for a dual purpose machine I would suggest the eight inch coil.
I purchased my Excalibur II at Windy City and would recommend Ron as well.
Tell Ron that eTreasure Hunter sent you.
Minelab Excalibur II (Two) 1000 Underwater Metal Detector
Minelab Excalibur 1000 Metal Detector
Fisher CZ-21 Metal Detector with 10" Coil
Fisher CZ-21 Metal Detector with 8" Coil