My girls are on the Volkl 20/20 skis, the predecessors to the gammas. They like them just fine.
That said, I've heard so much good stuff about the t-9 x that I would buy some for my girls if I had any money.
One of them loves the looks of the Phat Luv and wants them just cause they're pretty!
Before I bought the Volkls a couple of years ago, they demoed all kinds of skis. They thought they were all good, so we bought the ones we got the best deal on.
You might try the K2 Escape 5500 also. Not a female specific ski, but a very nice ski that is really cheap at Gart's right now.