Humidity, from what i have read and tried so far, isn't the biggest issue in keeping a Panther or a Veiled chameleon. Basically, there is three moments when they need higher humidity. The rest of the time, the humidity in your room should be enough.
The three moments are: early in the morning, before sleeping, and whenever the temperatures are higher than recommanded (for example, if your chameleons are housed outside, higher humidity and misting help them to stay healthy if it's too hot).
However, most people will recommend a good 60 to 80% humidity all the time, which is also very fine. I think this is the best for a beginner.
The Zilla combo is what i use now, and it seems very nice, unexpensive and very useful. Overall, i don't think i'll ever use something else!