yes that is ornate, same one that is sitting in the pic on a hand all tiny lol.

extra height is not really a waste if you have exo terra, it would be easier to control things, substrate doesn't dry out that much, light is not that bright and you can make it pretty when you have height. However when you have a baby you will need something way smaller, they get scared in big spaces = not eating= very big problems. so i suggest you get something small for now and when s/he is bigger you can upgrade.
hahaha aha green cornuta..... i better shut up now, those who are around here long time know that is a topic i better not go for lol and I'm getting one in less then 3 weeks, YAY!!!!! they have the prettiest horns and they are the most unique, and they are the most out of most.... see i told you i better not go there lol

auritas are awesome looking ones, adults are pretty much same size as ornatas, but of course it will depend on proper nutrition and environment.

to summarize, they all are pretty much the same, so just go with what your heart says and trust me soon you will be looking for another one lol