Best automatic humidifier?

[Sevvy]

I'm trying to figure out which snakes are feasible for me to keep. Every so often I need to leave my house for a few days, and it's part of why I chose my current snake-- he's a lower humidity species and (at least where I live) doesn't really need to be misted. I'd love to get a boa or python eventually, but I can't really commit to misting 1-2+ times a day.

So I'm wondering what everyone's experience is with automatic misters/humidifiers. Have you found one that works well? About what humidity level can they be trusted to keep the enclosure at?