Congrats girl- you get to be a bike bum! Having squandered my twenties on skates/ bikes/ liberal arts degrees/ never quite making the nat team in several sports, you're in for a treat. Life is good in spandex.
When you test ride it and it feels natural, it's probably going to be the right bike. That's been my experience- when I bought my Zaskar it was like an extension of my body on the test ride, then I made them order me a flashier color and the bike was destiny when it came in. New improved model. And alu with suspension is another world, I've put slicks on my mt beast to go on tours d'asphalt and been very comfy.
Have fun! I know it'll be a happy New Year ;D.

Lizzy