Design a simple, clean, yet powerful logo for Spartan Habits

Spartan Habits

I'm open to NOT including this slogan in the logo, but if desired you may include it: Life is short. Get something done.

The name of my website is Spartan Habits. I'm just getting started, so there isn't much there yet, but you can learn more here: http://spartanhabits.com

My tagline is: Life is short. Get something done.

The intent of this site is to share unique ideas for positive change in the simplest way possible. Hence the "spartan" portion of the name. I want the concept of simplicity to serve as the backdrop for the website, with positive, effective habit change at the heart of it all. I would like the logo to represent this concept. It should be clean, simple, yet memorable. I am open to artistic ideas.

I'd like to explore the following colors:

Dark neutrals: Formality, mystery, exclusivity and luxury.
Let designers make suggestions:

I currently have a logo that is alright, but I'm not in love with it. I'm including it with my request.