That could be a near imposable question to answer. What one considers best, another would consider poor.
Just about any VLF Discriminating detector will do what your asking. For the most part Florida is mineral free, making detector operation easy.
It sounds like your just starting out detecting, (no disrespect), and you would most benefit by paying a visit to your local metal detector dealer. Not only could they inform you of what is working well in that area, they also would be able to help you in setting up your detector.
$cash$ is also another consideration I'm sure. One can find a good operating unit starting at about $200.
Good luck