Its cool that you are reaching out to get others opinions and experience. Bottom line is get what you want. So many people are breeding reptiles, farming them, selling them, that a home is needed for each one. And even if a savannah monitor is farmed from the wild, you can find a healthy thriving animal, just keep looking. You'll be able to find one that's strong in health, just don't be led astray by sickly looking ones being sold cheap.

Savannah monitor is my pick. I've owned one, he was a placid doll most of the time and had tons of "big lug of a dog" personality. I'd share my crab with him (or he'd fuss around his cage), I'd fetch snails for him to gobble up, and I'd hold him. Sancho was a cool dude. I just don't want to keep lizards or large reptiles any longer. Maybe one day when I'm "settled down."