The last two times I have made reservations at airportexpress.fr, a shuttlebus service. They e-mail you a confirmation, and you phone from the airport when you arrive. The van usually arrives in about 5 minutes. My recollection is that the fare is about 15 euros per person, minimum 2 people, but that the price includes luggage. They can take other people, but its never happened on the way into Paris for me, but always on the way back. The shuttle takes you right to your hotel, for a guaranteed price, no matter what the traffic. A cab for two people would probably be at least 50 euros, so the shuttle is really a deal.