Hi there! I'm a fellow Southerner here in Belfast as well! I'm originally from Montgomery, AL and have been here for a little more than 2 years. If you dont' like the heat in Florida, all I have to say is that you'll LOVE LOVE LOVE the weather here because the last time it was 68F was about two weeks ago, since then it's been nice and cool.
I actually work with two other Americans in a little cafe on the Ormeau road, one of whom is married to an American, so we have our own little expat community. My friend Diana and I are always up for meeting people from the US, especially to chat about other things than the troubles ;-)