Hi Rachel-
I have had a lot of pets, including parrots, dogs, chickens, bearded dragons, and snakes. My tegus are really great for amount of enjoyment for the amount of work you put in. For amount of care, after they are set up, I think they are easier than bearded dragons because they don't need live food, and the struggle to keep them in good supply of calcium in their bones is easier because tegus are not evolved to have so much sun blasting on them as bearded dragons. they are definately easier than a parrot, not emotionally needy, but harder than chickens.
I believe that tegus need to be able to explore or roam about with close supervision, so be prepared to house them/it in it's own room, or share a room with it. I share a screened in porch/studio with my tegus. It works out well. they also have their own outbuilding with yard, but they are terribly spoiled. Once you get to know your tegu, the idea of keeping it in a cage is sort of like thinking of keeping your cat in a cage. They are very intelligent and responsive.
I highly recommend getting a baby from Agama international. they are fantastic, and have very hardy animals.
good luck, Ali