MSR Whisperlite Internationale. I have it, it's a multifuel stove meaning you can burn basically whatever type of fuel you come across. If you're in third world countries you'll be able to burn gasoline like you'd use for a car, which produces some soot but that's a minor annoyance considering how cheap it is. Here in the states I can fill my .6 liter fuel bottle for under a dollar, and that's a week's worth of cooking for one-two people.

It's also super-durable, easy to clean (just shake it) and will work at high altitudes if you ever need it to.