Experienced beach hunters know you don't find many gold or silver targets past 12" or so in the wet saltwater sand. I hunted with a friend that brought his ".50 cal," the Minelab GPX 5000. He was digging hot wheels cars at 38" in the dry sand, and chunks of DEEP iron in the wet sand. Nope, no thank you. You do not need an elephant gun to hunt rabbits.He is asking for a .50 cal rifle, you are offering a .22 pistol.
In your price range, there isn't much available new. The Sea Hunter and some of the Aquascan units are the only ones I can think of that are actually available. If you're willing to get a used machine, I'd look for a White's TDI beach hunter, Tesoro Sand Shark, or a Garrett Infinium LS. You might even get lucky and find a JW Fishers detector or a Minelab GPX machine in that price range, but, don't count on it. Some of those listed are pretty heavy and not ergonomically designed which makes them awkward and ungainly on land. I'd recommend buying a used one from a local detecting store that will offer a guarantee of some sort. They may also offer tips on how to best use it too.$1500 is as high as I will go