Well, if possible I'd have a body that was androgynous most of the time but could change from male to female at will.
But on a more realistic note, an androgynous body is the best compromise for me. I'm good with my height and weight. I'd like a firmer, more muscular body, a flatter chest. My face could be a little more masculine. I'd like slow growing facial hair, and a lower voice.
Hopefully this isn't too cheesy, but Taito Magatsu, my avatar, is similar to what I'd like to look like irl.