I've found that if you are not too particular you have more choices. If you are open to color and model but have specific wants for bells and whistles, that works. If you want a specific color and are open to the model and bells, etc.; that works. If you want a specific color model and options, wait for your reservation. The more flexibility you have the easier it is to pair you with a car. Keep contact with the sale rep you are dealing with and be patient.