Silkworms are actually a very good choice. I completely agree with BP Eliz about the other worm choices though. I switched from crickets for baby raising to silkworms because of the lower fat content and much higher protein.
Silkworms also contain more calcium than crickets, which is always a plus. I still dusted though with the fine repcal.
It has been a very long time since I dealt with Mulberryfarms, but they had terriffic customer service. I remember having a couple bad cultures which they replaced no questions asked. Here is a couple things I found on silkworms with a link:
Protien: Silkworms - 63.8% Crickets - 11.4%
Fat: Silkworms - 10.6% Crickets - 22.7%
Silkworms are also a good source for Calcium, Vitamins B1, B2, and B3, Protein, Iron, Magnesium and Sodium.
About silkworms
http://www.buyfruitflies.com/silkworm_info.html
Also, yes go with a Beardie!
EDIT: Also less chirps around the houseCrickets are still a fine choice though, people just tend to lump silkies with the other worms...and they are different.