I've had several white cars in the past, and whilst you can notice dirt on them more readily than some colours, if you stick to keeping on top of them, there shuoldn't be a problem. It's a little harder to get deep reflections on white, so you may be better off using a synthetic sealant, such as auto finesse tough coat, rather than a carnuaba wax. A sealant will last longer and tends to compliment white fairly well. Having said this, if you enjoy waxing the car like myself, there is no reason not to use a natural wax instead. One thing to avoid however is the local "euro wash" or equivalent. Not only does their wash technique scratch and mar the surface of your car, but the harsh tfr and cleaners they use will strip all you wax protection and stain your rubbers. Have fun with your new car though !