We'll be driving from Disney Paris (thank goodness we're not going to Disney)

and driving to the Champagne/Reims area.
First stop
Tattinger for the tour.
Can you suggest a second stop. I'd prefer to do a small producer, rather than one of the large houses; unless you feel that a large house would be preferable to a small producer.
Related question... In the States, everyone knows
not to make a purchase at a winery. You're paying the regular street price or above. Does this logic hold true in France? Should I buy at a local store, or will I get ripped off buying champagne at Tattinger?