Pretty much anything you like, as long as you can maintain the animal safely, provide all of its needs and it's acquired legally. Some of the ones most likely to be suggested are:
Skinks: Blue tongues
Dragons: Bearded dragons
Monitors: Ridge-tailed monitors / pygmy mulga monitors
Geckos: Thick-tailed geckos
The first two (blue tongues, beardies) are the only ones in that list that really tolerate regular handling that well, if that's important to you. If handling isn't a priority for you, you might find the monitors to be more interesting.