Originally Posted by stimpy

The conundrum is that taking the bus during rush hour is quite unpleasant. I'd rather be stuck in an air conditioned Mercedes than a hot bus filled with people not moving on the highway. When I'm on my own, I would take the RER during rush hour and transfer to the metro line 1 to get to the hotel. But with the family I would spend the money for a taxi.

If your flight arrives at 10am, and you take an hour for immigration, baggage, etc., there will be less traffic and the taxi should cost between €40-50. But also the bus would hopefully not be as bad at that hour too.