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.