I would not buy a mountain bike without trying it out. Roadies coming over to the dark side don't always understand what a mtb should feel like, and many times will accept too big/too long as OK. Specialized does make awesome bikes, but I would spend some time researching frame sizes that fit someone of your proportions well.
I have a Spec FSR expert, WSD and I love it ---it's the demo of what I think became the Myka last year. I am 5-3.5 and ride a medium Women's frame, I have split proportions of leg/torso.
See if your shop will order one with out you having to buy it. There is NO WAY I would spend $2K on a bike if I couldn't try it first. Too many times you buy a bike without trying it, and the fit is NOT perfect and they try to convince you to take it any, "oh we'll just change the stem" for you. Which is not the same thing as a bike frame that is the right size.
Take a road trip to a place that has a good selection of different brands/sizes. Or, join a gals ride where you could try lots of differnt bikes just by trading.