Well, this post has been up for a month and not a single bite.
I know you don't want to hear this, but a JM that will look good growing in full sun in the south, let alone florida, is really looking for a pot of gold at the end of a rainbow.

Even in the north, in areas in warmer heat zones, JMs will have bad scorch and look bad at the end of a season. Similarly even in the shade in hot parts of the south, JMs will have visible signs of stress in the best of situations.

My advice to you is to be extremely wary of claims of any particular cultivar to thrive in heat or full sun in florida or in the south. Or anywhere. The heat/drought/sun tolerant gene for this species just doesn't exist.

The good news is if it's red-purple foliage you're looking for there are some better adapted species to your region.

If you don't want to take my word for it then my advice would be not to spend a large amount of money. Try a bloodgood or emperor that's relatively cheap and easy to come by. See how that does. If you can then visualize a 50% increase in performance and find that worth the money, then keep looking for the magic cultivar.