I got inspired from my Christmas list thread to add an activity tracker to my list, but I'm not sure which one.

I definitely don't want anything that I wear on my wrist, I always get annoyed by watches and bracelets. I was thinking the Fitbit One or Zip, I don't care too much about the sleep tracking, but I know the One tracks stairs and the Zip doesn't. I'm open to other suggestions, share your suggestions, experiences, and imput please!