IMO, Central Florida is the most attractive out of that bunch. That might not be saying much. They are the best long-term play out of the group. They are the largest or 2nd largest school in the US and are graduating 10,000 students each year. Their best years are ahead of them. The biggest problem is that they don't have a huge fan base today. It will take time to build the passionate fan base.
I've lived in the Orlando area the last 12 years. For the first half dozen, UCF was just the commuter school that played D1 sports. Within the last 4 or 5 years, I've started seeing more and more UCF stuff on cars as I drive around town. In the past, it seemed that many UCF grads still pulled for UF or FSU. More of the recent grads actually are UCF grads and UCF fans. It may take some time, but the would be a great conference member 10-15 years down the road. The question is if they are worth adding now.