Ask HN: Best development environment? (June 2017)

As of June 2017, if you could start over from scratch and had to spend a practical amount of money on one or more development environments (work, travel, home), and if you had some extra for other accessories (input devices, monitors, ergonomic stands, chairs, treadmill, elliptical, standing desk), or if you had a substantial amount of funding and wanted to ensure the developers in your startup were well taken care of, what would be the best environment to ensure a developer has (within reason) the best environment to be productive?