Hi Beane and Liza, thanks! That is a bunch of good feedback.
I actually think the Scott might be sometihng I need to try, because I really am not sure I need a shorter woman's frame...but I definitely DO need the women's bars and short reach, etc. In fact, I am also 5'6"...but my legs are a full 2 inches shorter than yours! 
I'm surprised about the Diva vs. the Orca for weight. The Diva I hoisetd was super light...although I did not compare to Orca. I understand that the Diva has tubes calibrated for women...thinner tubes, etc, for women?
Anyhow, this is all good input. Thanks!
"The best rides are the ones where you bite off much more than you can chew, and live through it." ~ Doug Bradbury