I sound like a broken record :-)
Demo, demo, demo, demo, and demo!
Skis that work for some may not work as well for others. While there really aren't any 'bad' skis anymore, some will fit your style, personality, technique, and ability level better than others. Take out lots of skis in from different manufacurers in different lengths - both men's and women's - then buy the one that makes you grin from ear to ear!
In the gear review forum, there's a demo report card.....print a bunch, take them with you, and make tons of notes. You don't necessarily have to buy the day you demo, but many places will apply your demo fee to your purchase, or they may sell their demo fleet at the end of the year - you can then purchase the exact ski that you fell in love with, usually at a huge discount.
As an aside.....be sure that you have good quality, appropriate, professionally and properly fitted boots.....this will affect your skiing MUCH more than the skis. If you're in a money crunch, as many of us are, spend your money here and buy used skis.
Geez oh peets. SnowHot and I are posting at the same time again ;-)