I, too, have been shopping for a new racing bike...for about 5 months now! I have only a few brief words of advice...
#1 - ride as much as you can. By riding, I don't mean tooling around a parking lot for 10 minutes. I mean, RIDE the bikes. Get a feel for them on the road, on different terrain. A good bike shop should let you do this (with proper collateral held, of course!)
#2 - listen to people, but don't LISTEN to people. I tried a bike because a girl on my team LOVES hers...I HATED it. Not my style, not the bike I want.
#3 - unless you are particularly small, i.e. petite, don't think that you have to buy a WSD bike. Boys bikes are just fine for us girlies!I'm not particularly petite, so I actually fit better on "men's" bikes than women's.
ummmmm....I think that's it. HAVE FUN!!! Keep us updated!