Looking for suggestions from experienced female riders on a decent first road bike. I'm 29 yrs. old and live in New Orleans, LA. (so the terrain is flat) I've done some riding, but never on a bike of my own. My goals are to train and to race; with the ultimate goal of riding in the Ride for the Roses next year (in honor of a friend w/ cancer). I have looked at Trek, Cannondale, Schwinn, Fuji and am overwhelmed! My price range is $500-$800. What would you rec for a respectable bike that will be good to train on and hopefully ride in Austin next year! Thanks in advance for the suggestions.