Beaded Lizard / Gila Monster are awesome but not an animal for handling.
If you want a big personality in a small package Ackies are promising. I have been doing similar research to you for a few years now and that's where I landed.
Brandon at Rare Earth has clutches hatching all the time and usually a few juvenile or adult single animals available. I would recommend checking with him if that's where your research leads you. Females and breeding groups can be tricky to care for but a single male doesn't have unreasonable care requirements, has a big personality in a small package, and handle quite well.