S. FL has great ATT service IME. ATT has a boatload of spectrum in your state, so that works in your favor.
Best way to evaluate phones is to do it in person, especially since you don't really narrow it down very much. If you feel you need to check out smartphones why not visit a corporate store and come back with some choices (based on what you saw & liked) so we can help narrow it down a little at that point(?)
I live in South Florida I have AT&T and the service is good, but I'm open to changing service. I have a Motorola flip phone that worked quit well but it is giving out. I'm looking for a new phone that I can hear good but I would like to be able to organize information and maybe get my email. I don't play games or use twitter, but I would like a bit more then what I have now. Any suggestions?