Leopard geckos sound like they'd fit what you want. They get around 8 to ten inches, and eat mealworms or superworms as a staple. These are much easier to keep than crickets, and dont make any noise. They need a 10 or 20 gallon encloser with reptile carpet, slate, paper towels or newpaper as substrate. When they get over 6 inches u can put them on sand, but they'll sometimes eat it and get impacted, so you have to watch them with it. Make sure u get one from a good breeder, and not any petstores. Most Leos in petstores dont look sick, but have crypto or parasite eggs inside of them. Leos need a warm side of about 90 degrees, and a cool side of room temp. They best way to heat their cage is with an UTH and rheostat so it doesnt overheat and burn your leo. They like the belly heat, and lights kinda bother them since they sleep during the day. I think leos would be perfect because you can leave a bowl of mealworms in their cage and you can go away for the weekend and they'll have food, also you can just leave the UTH on 24/7 so they'd also have heat while your gone. Leos get super tame and will eat from your fingers. You can take them out and they are very calm and mellow as adults (babies are another story lol) Any way, i think leos would it it great, and a good site is drgecko.com, later
Mac