personally i think the screameleons ultimate set up package is awesome (excluding habba mist) I mean depending on the age of chameleon you are getting you really don't want to overwhelm a 3 month panther in a giant enclosure(unless sectioned off accordingly) The habba mist is decent and it is a good system to start with especially if you only have 1 cham. Also the rest of the accessories easily transfer to a larger cage, that is why the light fixture is longer. Also they set you up with the proper UVB bulb and heat bulb (depending on where you live) You also get a digital thermometer and a hydrometer, also you get a $30.00 credit towards the purchase of your chameleon! On top of it all you get the 30 day health guarentee. Speaking from experience there is nothing worse than getting a chameleon for the first time and have it go right downhill and crash right as your 5 day health guarentee runs out.
Anyways, starting to go on a bit of a rant here (sorry). I think screameleons is a awesome company and after doing allot of research you can tell that they really care about chameleons and they are not so much in it for making a ton of money. Also on the website if you go to info they have videos of how to properly set up your enclosure and how to easily acclimate your new cham.
In conclusion pretty much the only thing you would need to upgrade is your cage to a decent size, most commonly this size from LLL reptile. They frequently go on sale as well so I would buy one when you see it on sale and then keep until he is ready for it.
LLL REPTILE
and i guess you would want a better misting system too...