Hi Steve, welcome to the forum. I live on the opposite coast line of FL as you (In Brevard County, so a little further south than you). I have dwarf cavendish that grows very well here. I've yet to have any suffer from any light freezing and I get GREAT fruit production on them every year. Your best bet would probably be a giant cavendish to get as close to the store bought variety in size. Would you consider an Ice Cream as they are cold tollerant, very tasty (much better than what's at the store), and most important: WIND TOLLERANT, very important here in Florida! Click this to go to it's description in the wiki:
Musa Ice Cream (Blue Java) - Bananas Wiki I've been told by many if they could only grow one, this would be it. I cannot answer on any of the FHIA varieties though. Wish you luck on your search to the right variety. Josh
PS: Love how all the newbies are answer this one as I'm pretty new still as well! LOL