If it's a long flight, I would recommend a town car or limo. There is nothing worse then fighting a shuttle at the end of a long day of travel. I've personally had or heard of awful experiences with most of them. You may luck out and get a decent driver, but we never have.
We did a limo last year and it was SO worth the extra $50. So relaxing. No psychotic driving, no circling the airport, no rude drivers, no sharing with 3 other families, no carsick kids. SO worth it.