Hi!
You know, I would just encourage you to pick a song you really like -- one that you have a lot of interest in, or touches you particularly. Especially if it's a Chris, Stevie or Lindsey song, I don't think you'll have any trouble finding folks who want to contribute their ideas. Make it one that means something to you, because that's a great motivator for being very interested in what others think about it too, and for "doing the song justice."