What other herps do you have?
You mention you want something less common for an intermediate keeper, but I am just wondering if your experiences would be as relevent to lizard care? I don't know a tonne about lizards, but I do know that they can vary quite a bit, as with other herps. I mean I'm sure there are transferable skills there as well, but you can never be too careful! I totally understand the uniqueness factor, but there might be other species to check out as "starter" lizards, to get you eased into their care.
Just an idea.
Best of luck!
Lizards do require a bit more attention especially of you are dealing with a more intelligent species. The more attention you give them the tamer they become.