Marc - You are quite correct that we firmly disagree on the advisability of taking the RER and/or Metro with luggage from CDG into Paris. IMNSHO, schlepping luggage onto and off of those commuter trains would be a seriously off-putting introduction to the most beautiful city in Europe. Half the time, the escalators aren't working, which adds to the "pleasure" of the luggage schlep.

This is a time when a small splurge is in order - take the taxi!!!

PS - I agree that Relais Christine is an excellent choice.