Hi Matt,
Good for you to check. A "complete" powder would be impossible as there is still some controversy over nutritional needs as it is. Mimicking nature the best we can is a healthier way to go - a variety of feeders which have dined on a variety of items.
Crickets really aren't that bad, but roaches (I would suggest non-climebrs) are a perfectly good staple (I am in the process of switching over), but, as Anthony pointed out a variety is key. Apparently your geckos don't tire of mealworms, but chams can get VERY picky.
There is a feeder nutritional chart in the Sept. 2002 issue of ChamNews at: http://www.chameleonnews.com/year2002/sept2002/nutrition/nutrition_sept_02.html
As for other research you can start at this KS article which will direct you to a lot of sites for info, vets, and questions to ask. Hopefully, all this will help you decide if a cham is right for you or not. That same site (ChamNews) also has an excellent article on the Costs of Keeping a Cham.
Here's a link to the resource article
lele
>>Exactly what I wanted to know. I appreciate the prompt response. I feed my leos exclusively mealworms, they get the protein/fat from them, the calcium and vitamins are from the supplements. The way i look at it the mealworms are just the messenger for what is needed. I am surprised they don't have a complete powder that you could sprinkle on anything that the animal would eat. Seems that is where human food is evolving to.
>>
>>Matt
Chameleon Help & Resource Info
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0.1 veiled - Luna
0.2 felines - Kyndra and Líta
1.0 African Clawed Frog - Skipper
0.3 Mad. Hissers (2 died ;(
0.1 Chilean Rose Hair Tarantula (no name yet)
0.1 Goliath Bird-Eater Tarantula - Natasha