Wow, that's quite the enclosure. I love it.
I don't know a lot about lizards. I think the main thing to consider is the accessibility of the lizard you want.
Rare, unusual, it's great, but not easy to find and will probably cost you a pretty penny, not only in the purchase but vet care.
I think alligator lizards are beautiful. Very colorful, big like you want, but when it comes to their care, I have no idea. Also, I don't know where you'd find one.
Wish I could be more helpful.
Let us know what you end up getting. :)
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