I'd either go for a Ackie (Varanus acanthurus), or if you have the space a Savannah Monitor (Varanus exanthematicus).
Ackies stay quite small, and they can be "tamed" down a bit.
Savannah's are quite large, but they can be "tamed" down a lot.
Personally, I like Tegus more.
Just make sure you get a CB, well acclimated animal and you'll be fine. Each Monitor/Tegu has it's own specifics of care. Most are pretty simple to care for. Proper basking, UV (if required), decent sized enclosure, lots of food.
Certain Dwarf Monitors are quite fragile and wouldn't be a suggested beginner at all, however; these animals are generally in the $600 plus price range.
Blue Tree Monitors have just started becoming available to the pet trade. Most are quite fragile. I'm not sure on Captive Size or Care. Sorry.
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