Search engines are getting smarter and smarter day by day. If you are building this website for long term engagement, you might wanna consider building your own identity without basing it on search results. What you need to build is your brand and authorship.
Time will come, this domain hype will be devalued. I myself get surprised sometimes when I search, domains of those helpful articles on search results are names of those authors or even just gibberish nonsense.
Lastly, you cannot get that domain on first page easily, especially with google penguin algorithm. If, however, you manage to do so in the near future, new powerful algorithm will be out and will ruin everything.
Instead of wasting your money on this premium domains, why not spend it on your development and marketing strategy. I suggest www.oneblueearth.com, same as your username. Good luck!