At CDG? In my humble opinion, book a taxi. You're wasting your money if you pay for anything more. In Paris, taxi transfers to/from CDG are charged at a mandatory fixed rate (about EUR 55, plus I'd give the driver a EUR 5 cash tip on top of that).
I normally use G7 taxis in Paris and they're perfectly clean and comfortable rides.
Just make sure you allow time to get through immigration when you're booking the taxi. 60-75 minutes would be a good idea (though I don't know if there's a priority lane for business class passengers, which would change the timing!).