Like Jack said, I'd go with the standard cage too. I always see my boy not using all four limbs when moving from one branch to another and using his tail instead for support. Is he missing a front or back limb? I read somewhere that they rely more on their back limbs than the front ones.
I'm one of those that was fixed on getting a glass enclosure for my chameleon just cuz they look prettier, but I'm honestly glad I didn't and I'd advice against it after everything I have read and the advice I have received on this forum. Personally, my chameleon LOVES climbing through the screen of his cage too.
Also, being arboreal creatures, I think a tall cage is a must. At this point, I'm sure the little guy has figured out how to move around and balance himself on leaves and branches. I feel like a chameleon in a short, long cage might feel extra trapped and stressed, and his health could decline rapidly. Like Jack said, I would make sure to cover the bottom with something soft and easy to clean up in case he does fall.
I went to AC Moore the other day and found these long ivy vine silk plants that you could put throughout his cage. I attached the end to the top of the cage, and kind of zig zagged it all over the enclosure using the screen of the cage and a small metal wire to attach the vines (if you do this, make sure to leave ALL the pointy sides of the wiring outside of the cage so they don't accidentally poke and hurt your cham). This could give your cham tons of layers throughout his enclosure and being soft material, they could significantly slow down a fall or even catch him if he were to lose his grip. Plus, they make the cage look beauuuutiful and are super cheap! one really long chain of these was only $4.99. Here's a pic of exactly what I got.
Good luck and don't forget to share some pics!!!