72 gallon tank - What to put in. hmmmm

[Talisman]

Hi there......so imagine you have a 4'x18"x24" tank....you have a wire screen lid. You've got the UVB lights, the heat lamp etc. Except that it sits empty.
What would you put in, following the below guidelines......
1. Lizard type reptile (no snakes, sorry snake people, wifes rules)
2. Animal must not outgrow tank
3. Friendly "pet" like animal. (not neccesarily handling, but maybe hand fed tame)
4. Does not neccessarily require live food. Cat food, salad, veggies, earth worms etc.
5. Dirunal (day time awake)

What would you put in it. The world is your oyster. lol

You can hopefully see what I have below in my signature......what should I put in this tank? A australian water dragon? Some type of dwarf monitor? Small tegu?

Thanks!