Thanks in part to Rick Steves' wonderful France guidebook and responses in this forum, I have mapped out a tentative itinerary for an upcoming driving trip. I won't bore people with the specifics, here, but I came to the conclusion that there was more to see for us in Brittany than Normandy, and gave that an extra day. The sights in Brittany are both along the coast (to the north and west), and in interior sections. Our intended sights in Normandy are primarily along the coast, e.g., Bayeux on east. As such, we can see more in less time in Normandy.
We will be driving first to Brittany from Amsterdam in order to get the longer driving run out of the way first, and then work our way back towards Amsterdam.
This is more of a comment than a request for responses, although your comments, as they were before, are appreciated.