There are a lot of snakes that would go into that enclosure but it really sound's like you have your heart set on a skink. If that's the case then definately get a skink. If you know of anyone who can come in and check on the lizard (best option) or a place where you can board it (some pet shops and veterinarians will board) while you are travelling just go for it. Everyone who has them seems to love them.
Ah, you saw right through me! Doing some (a.k.a. LOTS) of research and they are getting to me...
Thank you again, everyone, for the thoughtful suggestions!!
Don't let anyone, ever, make you feel like you don't deserve what you want. - Heath Ledger