Ah, I wouldn't go for a girls ski especially if you want to take your skiing to the next level. There's a lot of hype about what length is good for shorter skiers but if you ski aggressively, don't get into a smaller ski for powder. Go for something that has rocker to float you through pow and still handle on the groomers. I'm 5'3" 115 on the 175 jj's and they kill it.
Below is another thread with some options. Most of the skis have lengths from 169 - 179, Liberty Helix comes in 167 too, you should be good on any of them
Good luck -
huck it already.