the thing with bearded dragons, is they require a MUCH larger living space once they're all growed up. i would recommend something at least 18 inches wide, and 3 feet long. they need the width to turn around.
and in my experience with cresties, they are pretty jumpy sometimes. and i'm TERRIFIED of pulling their little tails offbut then again i've never really met cresties that have been handled a ton. and i assume they're kind of like most lizards, a little skittish when they're young, then calm down once they're older.
and i have a leopard gecko that is quite jumpy; he's 3 years old and i got him as a retired breeder. so i have a feeling he wasn't handled much either, just used for breeding.
just thought i'd throw those few points out there.