I made the decision a few days ago to use a Pen Name.
Originally, I thought I would just use my married name. My reasoning was it was different and would stand out. However, the more I researched, I realized it might actually be a detraction. It's always difficult for people to pronounce, let alone spell.
After a few pages of ideas I finally picked Sandra Kyle. It's short and sweet, easy to remember, and not very long.
This is a great article that helped: http://www.smallbluedog.com/how-to-choose-a-pen-name.html