There are a lot of boats available on the west coast of Florida. So, yeah, if you're planning to move down here it would seem silly to buy a boat before you do so.
As mentioned, there is a lot of shallow water around here (as well as in the Keys, and the Bahamas). Hence, look for something with relatively shallow draft. Personally, I would look for 5' or less. It is pretty common to see boats for sale here in the Tampa Bay area--sitting and sitting, without selling--that would sell in a New York minute almost anywhere else, and for more money. But they have 6' or 7' drafts, and no one around here wants that. It is just too limiting.
Good luck.