The Rex Begonias are really pretty, they started showing up more around here the past couple years in garden centers, but then end up on the clearance racks half dead, obviously other FL gardeners already knew they don't like the heat here.
I had a Rex Cissus discolor vine many years ago, it really did well in a shady area, unfortunately I left it out when we had temps into the upper 20's and lost it, I've never seen one again, or I would buy it.