I think Ben is refering to a Sulccata. I would avoid those as they get big and would need lots of room (I have a buddy here with one and he basically lets it roam the yard from spring to fall. In winter it is in a 2.5m x 2.5m pen and it sulks the whole time
If you don't want snakes then I agree that leopards are a good choice. I used to own a pair of African fat-tails and they were great!! Super docile.