It's a long way in the future (assuming it ever happens -- my internal oracle says it will, but I don't know), but I'm leaning towards Elise or Alison. I like Ellen, but it's too close to my current name. (I'm confusing enough, I don't want to add to the confusion.)
On the other hand, Melissa has a nice sound to it.
It looks like I'm into names with liquid sounds; maybe it means I'm really amorphous inside. ("My gender identity is: Jello!")