well, a compact double would probably be fine for you then. All I can say is ask lots of questions. Remember, your standover height is not the only important measurement when buying a bike. If you are proportioned like an average woman, your legs will be long enough for a bigger bike than your arms are. Thus the WSD. The women's specific dimensioned bikes.
If you don't take this into account you might end up with neck, back and hand issues.

Again, a really good LBS helps a lot.