Experienced Savannah Monitor keeper looking for bigger monitor

Basically, what it says. I have several years of experience with Savannah monitors, and I recently moved into a larger place with a spare bedroom I would like to dedicate to a larger monitor species.

I am slightly opposed to getting a Nile Monitor, don't live in a region where providing shellfish for a Dumeril's would be feasible, and would prefer to spend less than 1000 dollars on the purchase of the animal itself. There are no local or state laws forbidding any monitor species, for me. I would prefer something that is relatively tame and comfortable with being handled, and relatively intelligent. I'm curious what everyone thinks would be the next logical step to take - white or black throats are the likely contenders currently but I am open to any sort of suggestion.