Am I focusing too much $$ on retirement?

[tkopel]

You should also look into the Roth TSP that was just made available this past OCT. you can put up to the $17500 limit between the Roth and the traditional TSP. this way you will benefit from your current low tax bracket. This does not affect your contribution to a regular Roth also. Save as much as you can while you can so things like children/marriage/change in careers in the future don't derail your goals.
Good luck, you are making a great start!