I have a few 'holy grail' chameleons on my to-get list.
1) Parson's: they look like a wise, ancient, tree wizard. I like how long they live and how big they get, and how smooth and vibrant their skin/coloring is.
2) Montiums and Quadricornis: they are kind of similar and both equally as cool as the other. I love any reptiles with sailfins on their backs and horns, and these guys have BOTH. So cool.
3) Laterispinis: really cool scale adaptations that make their big scales look like thorns. They are like the Uroplatus of the chameleon world.
4) And of course panthers! Such incredible colors. My fav is Nosy Mitsio, Ambilobe and Nosy Be.