I don't know the cost of a taxi, but we are using a towncar service. We are paying $75 (with $5 voucher off website) return trip to the Dolphin, but I think Contemporary is a shade more as it is that bit further away. The driver will be at the airport waiting for you with a card with your name on it.
I would also recommend using a towncar service - they are quite reasonable and you can book online - if you book a round trip on-line, you can print off a $5 voucher from their site. A Towncar service I would also recommend is www.fltours.com