What is the best IDE for developing in Golang?

Original gopher plushie photo courtesy Sean Tasdemir.

You’ve done it. You’ve looked into Golang, and you’re convinced that it fits your use case — or maybe you just want to get started and code in your own local environment instead of an online playground.

Then comes the inevitable question: which IDE do you use? Sure, you could go with the IDE you’ve been using for other languages, but is that the best IDE for Go?