The Bower package is a perfect drop-in tool you can use to create local builds.
You can simply do:
bower --save arcgis-js-api
You can find more detailed samples in the guide. These samples demonstrate how to use the Bower package to install directly into your working directory, set up your development environment and do a local build of your application in both Dojo and RequireJS.
Whatever you decide, you are still building awesome apps!
For more geodev tips and tricks, check out my blog.