super worms
I know Brad Ramsey swears by superworms. I also am supportive of feeding supers as a staple diet. They are slow prey and are very easy to gutload. You can gutload them with anything you would gutload crickets with. These guys are also pretty inexpensive and have a long shelf life.
Silkies and hornworms are def. your best bet when it comes to staple diet, because nutritionally they are superior to just about anything else.
-The downfall to using silk/hornworms as a staple is they may refuse to eat other insects (crickets, roaches, superworms, the occasional waxworm). Another negative thing about using silkworms and hornworms as a staple diet is the cost issue and also the shipping issues.
-IE silk/horn worms are not cheap even when you buy in bulk you're looking to spend $50+ for a decent supply (for 1+ large chameleons). They may be DOA too, they don't do so well in very hot and very cold shipping conditions, or if it's decently warm out, you may have ordered medium or small silkworms and hornworms but they'll arrive as larges or jumbos because of how fast they grow.
-Silkworm and hornworm companies CAN run out of them as well when a lot of people are ordering. Oh yah, and if they run out of a particular size you may have to wait for them to grow up a bit for your cham, or they may only have sizes in that are too big for your cham.
++ Don't get me wrong, i wish i could afford to use silkworms and hornworms more often, but for someone on a fixed budget it's just not a practical decision to use them as a staple or anything other than a treat now and then.
Just some things to think about...