First off, since your dragons are different sizes and since you didn't mention sex, it would be best to get two new cages, one for each dragon. Minimum size for a single bearded dragon is 4'x2'x2' or roughly the equivalent size of a 50gal long tank. Second, you can build your cage yourself, buy a pre-made cage or large aquarium, all are suitable for bearded dragons. For pictures and ideals, the cage/habitat forum has quite a few. forums.kingsnake.com/forum.php?catid=4
Unfortunately I don't know what happened with the pictures I had for my bearded dragon, before I sold her and the cage. It may be uploaded under my regular nic, if not then it's gone, sigh.
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PHLdyPayne