The Myka is a gorgeous bike and I'm rather envious that you can ride a women's specific bike in the Specialized lineup.

I don't know what your budget it, but if you can, consider the Myka HT Expert. I think you will be happier with the components. Also, if weight is a concern, consider reducing your *rolling weight* by going with lighter rims, tires, and cranks. I have a Specialized Rockhopper and I reduced the weight of my bike by 3 lbs by doing that.

One thing to consider about a lighter bike is that you'll not have as smooth a ride, particularly on a hardtail. The heavier bike will absorb more of the shock.

I hope this helps and when you get your new bike, please share lots of pictures of her. Good luck and hope the suggestions from fellow TE'ers help you in your decisions.