Can we see a pic of your enclosure and where the next plant is going to go? Different plants have different care needs re: sun and placement. The pic @AmandaS shared has some good options. Sounds like a money tree might make sense for you. Or a draceana / corn plant.
Pothos plants definitely are good. Their long vines can be trained and tied up all over the cage allowing for multiple things for the chameleon to climb on. And the cup like leave pattern allows for some nice water droplets to pool on them.