L.B.
I did the Fl Prepaid and really like how flexible it is. You can pay for tuition and room and board, or just tuition. You can pay over time, or as one lump sum. And you can pay for as many semesters as you want...
I just did tuition, but I think I will add 1 year of room and board soon.
I can tell you that it's a big relief to have the tuition paid for...
Here's their link:
http://www.florida529plans.com/signuptoday/index.html