If you want an insect that is really nutritious for your cresteds try phoenix worms: http://www.phoenixworm.com. You can also feed silkworms, although I have not purchased them before so I can't recommend a good place to get them.
Waxworms really aren't very good as a feeder because of their high fat content. As an occasional treat or mixed in with other insects for an animal that needs to put on weight they are okay, but that's all I would recommend them for. Repashy isn't high in fat because you shouldn't feed your gecko a diet high in fat--that's not a reason why it is okay to feed them an insect that is high in fat, but rather a clue as to the fact that they should not have a high fat diet. You don't want a "porked up" gecko, rather a gecko that is at a nice healthy weight for its age and general bone structure.
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