Our plan is to arrive at DeGaulle Airport [9/13] and take the TGV from there south = either to Lyon or to Poitiers. From there we will rent a car and drive to wherever our lodging ends up being in Dordogne and stay there a week+ before returning to Paris & later, to home. I'm trying to decide between TGV to Poitiers and staying there 1-2 nights or Lyon and doing likewise. Suggestions and ideas? Do we need to get our rental car right upon arrival in the city or can we move around and see some things in the city and then get the car?? Thank you.