Leopard gecko! (Leo) they're awesome, I've got the one at the moment, they're really easy to care for and as this will be your first lizard, they are quite tolerant of their surroundings. So it doesn't matter if you forget to feed one night, or their temperature drops by a couple of degrees. You don't really have to worry. As long as you get on top of anything that goes wrong fairly wuick you should be fine.
And as long as you tame him or her, it will be great with kids!