Personally I'm not a fan of lizards, although there is one that I would consider getting - a Red Tegu! Some day when I move my reptile shop into a dedicated building I'll get a red tegu and let the guy run around the shop while I'm working like a little dog LOL. You know what they say in the retic world, go big or go home!
I have loved my experience keeping a tegu. However, I wouldn't really let them roam lol. They are relentlessly destructive sometimes. Also, make sure you don't turn it into a ball of fat as so many people do.